extensions/renderer/dispatcher.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "extensions/renderer/dispatcher.h"
   6
   7 #include "base/bind.h"
   8 #include "base/callback.h"
   9 #include "base/command_line.h"
  10 #include "base/containers/scoped_ptr_map.h"
  11 #include "base/debug/alias.h"
  12 #include "base/lazy_instance.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/metrics/histogram_macros.h"
  15 #include "base/metrics/user_metrics_action.h"
  16 #include "base/strings/string_piece.h"
  17 #include "base/strings/string_split.h"
  18 #include "base/strings/string_util.h"
  19 #include "base/strings/utf_string_conversions.h"
  20 #include "base/synchronization/lock.h"
  21 #include "base/time/time.h"
  22 #include "base/values.h"
  23 #include "content/grit/content_resources.h"
  24 #include "content/public/child/v8_value_converter.h"
  25 #include "content/public/common/browser_plugin_guest_mode.h"
  26 #include "content/public/common/content_switches.h"
  27 #include "content/public/common/url_constants.h"
  28 #include "content/public/renderer/render_frame.h"
  29 #include "content/public/renderer/render_thread.h"
  30 #include "extensions/common/api/messaging/message.h"
  31 #include "extensions/common/constants.h"
  32 #include "extensions/common/extension_api.h"
  33 #include "extensions/common/extension_messages.h"
  34 #include "extensions/common/extension_urls.h"
  35 #include "extensions/common/feature_switch.h"
  36 #include "extensions/common/features/behavior_feature.h"
  37 #include "extensions/common/features/feature.h"
  38 #include "extensions/common/features/feature_provider.h"
  39 #include "extensions/common/manifest.h"
  40 #include "extensions/common/manifest_constants.h"
  41 #include "extensions/common/manifest_handlers/background_info.h"
  42 #include "extensions/common/manifest_handlers/content_capabilities_handler.h"
  43 #include "extensions/common/manifest_handlers/externally_connectable.h"
  44 #include "extensions/common/manifest_handlers/options_page_info.h"
  45 #include "extensions/common/message_bundle.h"
  46 #include "extensions/common/permissions/permission_set.h"
  47 #include "extensions/common/permissions/permissions_data.h"
  48 #include "extensions/common/switches.h"
  49 #include "extensions/common/view_type.h"
  50 #include "extensions/renderer/api_activity_logger.h"
  51 #include "extensions/renderer/api_definitions_natives.h"
  52 #include "extensions/renderer/app_window_custom_bindings.h"
  53 #include "extensions/renderer/binding_generating_native_handler.h"
  54 #include "extensions/renderer/blob_native_handler.h"
  55 #include "extensions/renderer/content_watcher.h"
  56 #include "extensions/renderer/context_menus_custom_bindings.h"
  57 #include "extensions/renderer/css_native_handler.h"
  58 #include "extensions/renderer/dispatcher_delegate.h"
  59 #include "extensions/renderer/document_custom_bindings.h"
  60 #include "extensions/renderer/dom_activity_logger.h"
  61 #include "extensions/renderer/event_bindings.h"
  62 #include "extensions/renderer/extension_frame_helper.h"
  63 #include "extensions/renderer/extension_helper.h"
  64 #include "extensions/renderer/extensions_renderer_client.h"
  65 #include "extensions/renderer/file_system_natives.h"
  66 #include "extensions/renderer/guest_view/guest_view_internal_custom_bindings.h"
  67 #include "extensions/renderer/i18n_custom_bindings.h"
  68 #include "extensions/renderer/id_generator_custom_bindings.h"
  69 #include "extensions/renderer/lazy_background_page_native_handler.h"
  70 #include "extensions/renderer/logging_native_handler.h"
  71 #include "extensions/renderer/messaging_bindings.h"
  72 #include "extensions/renderer/module_system.h"
  73 #include "extensions/renderer/print_native_handler.h"
  74 #include "extensions/renderer/process_info_native_handler.h"
  75 #include "extensions/renderer/render_frame_observer_natives.h"
  76 #include "extensions/renderer/renderer_extension_registry.h"
  77 #include "extensions/renderer/request_sender.h"
  78 #include "extensions/renderer/runtime_custom_bindings.h"
  79 #include "extensions/renderer/safe_builtins.h"
  80 #include "extensions/renderer/script_context.h"
  81 #include "extensions/renderer/script_context_set.h"
  82 #include "extensions/renderer/script_injection.h"
  83 #include "extensions/renderer/script_injection_manager.h"
  84 #include "extensions/renderer/send_request_natives.h"
  85 #include "extensions/renderer/set_icon_natives.h"
  86 #include "extensions/renderer/static_v8_external_one_byte_string_resource.h"
  87 #include "extensions/renderer/test_features_native_handler.h"
  88 #include "extensions/renderer/test_native_handler.h"
  89 #include "extensions/renderer/user_gestures_native_handler.h"
  90 #include "extensions/renderer/utils_native_handler.h"
  91 #include "extensions/renderer/v8_context_native_handler.h"
  92 #include "extensions/renderer/v8_helpers.h"
  93 #include "extensions/renderer/wake_event_page.h"
  94 #include "grit/extensions_renderer_resources.h"
  95 #include "third_party/WebKit/public/platform/WebString.h"
  96 #include "third_party/WebKit/public/platform/WebURLRequest.h"
  97 #include "third_party/WebKit/public/web/WebCustomElement.h"
  98 #include "third_party/WebKit/public/web/WebDataSource.h"
  99 #include "third_party/WebKit/public/web/WebDocument.h"
 100 #include "third_party/WebKit/public/web/WebFrame.h"
 101 #include "third_party/WebKit/public/web/WebLocalFrame.h"
 102 #include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
 103 #include "third_party/WebKit/public/web/WebScopedUserGesture.h"
 104 #include "third_party/WebKit/public/web/WebSecurityPolicy.h"
 105 #include "third_party/WebKit/public/web/WebView.h"
 106 #include "third_party/mojo/src/mojo/public/js/constants.h"
 107 #include "ui/base/layout.h"
 108 #include "ui/base/resource/resource_bundle.h"
 109 #include "v8/include/v8.h"
 110
 111 using base::UserMetricsAction;
 112 using blink::WebDataSource;
 113 using blink::WebDocument;
 114 using blink::WebScopedUserGesture;
 115 using blink::WebSecurityPolicy;
 116 using blink::WebString;
 117 using blink::WebVector;
 118 using blink::WebView;
 119 using content::RenderThread;
 120
 121 namespace extensions {
 122
 123 namespace {
 124
 125 static const int64 kInitialExtensionIdleHandlerDelayMs = 5 * 1000;
 126 static const int64 kMaxExtensionIdleHandlerDelayMs = 5 * 60 * 1000;
 127 static const char kEventDispatchFunction[] = "dispatchEvent";
 128 static const char kOnSuspendEvent[] = "runtime.onSuspend";
 129 static const char kOnSuspendCanceledEvent[] = "runtime.onSuspendCanceled";
 130
 131 void CrashOnException(const v8::TryCatch& trycatch) {
 132   NOTREACHED();
 133 };
 134
 135 // Returns the global value for "chrome" from |context|. If one doesn't exist
 136 // creates a new object for it.
 137 //
 138 // Note that this isn't necessarily an object, since webpages can write, for
 139 // example, "window.chrome = true".
 140 v8::Local<v8::Value> GetOrCreateChrome(ScriptContext* context) {
 141   v8::Local<v8::String> chrome_string(
 142       v8::String::NewFromUtf8(context->isolate(), "chrome"));
 143   v8::Local<v8::Object> global(context->v8_context()->Global());
 144   v8::Local<v8::Value> chrome(global->Get(chrome_string));
 145   if (chrome->IsUndefined()) {
 146     chrome = v8::Object::New(context->isolate());
 147     global->Set(chrome_string, chrome);
 148   }
 149   return chrome;
 150 }
 151
 152 // Returns |value| cast to an object if possible, else an empty handle.
 153 v8::Local<v8::Object> AsObjectOrEmpty(v8::Local<v8::Value> value) {
 154   return value->IsObject() ? value.As<v8::Object>() : v8::Local<v8::Object>();
 155 }
 156
 157 // Calls a method |method_name| in a module |module_name| belonging to the
 158 // module system from |context|. Intended as a callback target from
 159 // ScriptContextSet::ForEach.
 160 void CallModuleMethod(const std::string& module_name,
 161                       const std::string& method_name,
 162                       const base::ListValue* args,
 163                       ScriptContext* context) {
 164   v8::HandleScope handle_scope(context->isolate());
 165   v8::Context::Scope context_scope(context->v8_context());
 166
 167   scoped_ptr<content::V8ValueConverter> converter(
 168       content::V8ValueConverter::create());
 169
 170   std::vector<v8::Local<v8::Value>> arguments;
 171   for (base::ListValue::const_iterator it = args->begin(); it != args->end();
 172        ++it) {
 173     arguments.push_back(converter->ToV8Value(*it, context->v8_context()));
 174   }
 175
 176   context->module_system()->CallModuleMethod(
 177       module_name, method_name, &arguments);
 178 }
 179
 180 // This handles the "chrome." root API object in script contexts.
 181 class ChromeNativeHandler : public ObjectBackedNativeHandler {
 182  public:
 183   explicit ChromeNativeHandler(ScriptContext* context)
 184       : ObjectBackedNativeHandler(context) {
 185     RouteFunction(
 186         "GetChrome",
 187         base::Bind(&ChromeNativeHandler::GetChrome, base::Unretained(this)));
 188   }
 189
 190   void GetChrome(const v8::FunctionCallbackInfo<v8::Value>& args) {
 191     args.GetReturnValue().Set(GetOrCreateChrome(context()));
 192   }
 193 };
 194
 195 class ServiceWorkerScriptContextSet {
 196  public:
 197   ServiceWorkerScriptContextSet() {}
 198   ~ServiceWorkerScriptContextSet() {}
 199
 200   void Insert(const GURL& url, scoped_ptr<ScriptContext> context) {
 201     base::AutoLock lock(lock_);
 202     CHECK(script_contexts_.find(url) == script_contexts_.end());
 203     script_contexts_.set(url, context.Pass());
 204   }
 205
 206   void Remove(const GURL& url) {
 207     base::AutoLock lock(lock_);
 208     scoped_ptr<ScriptContext> context = script_contexts_.take_and_erase(url);
 209     CHECK(context);
 210     context->Invalidate();
 211   }
 212
 213  private:
 214   base::ScopedPtrMap<GURL, scoped_ptr<ScriptContext>> script_contexts_;
 215
 216   mutable base::Lock lock_;
 217
 218   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerScriptContextSet);
 219 };
 220
 221 base::LazyInstance<ServiceWorkerScriptContextSet>
 222     g_service_worker_script_context_set = LAZY_INSTANCE_INITIALIZER;
 223
 224 }  // namespace
 225
 226 Dispatcher::Dispatcher(DispatcherDelegate* delegate)
 227     : delegate_(delegate),
 228       content_watcher_(new ContentWatcher()),
 229       source_map_(&ResourceBundle::GetSharedInstance()),
 230       v8_schema_registry_(new V8SchemaRegistry),
 231       is_webkit_initialized_(false),
 232       user_script_set_manager_observer_(this),
 233       webrequest_used_(false) {
 234   const base::CommandLine& command_line =
 235       *(base::CommandLine::ForCurrentProcess());
 236   set_idle_notifications_ =
 237       command_line.HasSwitch(switches::kExtensionProcess) ||
 238       command_line.HasSwitch(::switches::kSingleProcess);
 239
 240   if (set_idle_notifications_) {
 241     RenderThread::Get()->SetIdleNotificationDelayInMs(
 242         kInitialExtensionIdleHandlerDelayMs);
 243   }
 244
 245   script_context_set_.reset(new ScriptContextSet(&active_extension_ids_));
 246   user_script_set_manager_.reset(new UserScriptSetManager());
 247   script_injection_manager_.reset(
 248       new ScriptInjectionManager(user_script_set_manager_.get()));
 249   user_script_set_manager_observer_.Add(user_script_set_manager_.get());
 250   request_sender_.reset(new RequestSender(this));
 251   PopulateSourceMap();
 252   WakeEventPage::Get()->Init(content::RenderThread::Get());
 253
 254   // chrome-extensions: and chrome-extensions-resource: schemes should be
 255   // treated as secure because communication with them is entirely in the
 256   // browser, so there is no danger of manipulation or eavesdropping on
 257   // communication with them by third parties.
 258   WebString extension_scheme(base::ASCIIToUTF16(kExtensionScheme));
 259   blink::WebSecurityPolicy::registerURLSchemeAsSecure(extension_scheme);
 260
 261   WebString extension_resource_scheme(base::ASCIIToUTF16(
 262       kExtensionResourceScheme));
 263   blink::WebSecurityPolicy::registerURLSchemeAsSecure(
 264       extension_resource_scheme);
 265
 266   // chrome-extension: and chrome-extension-resource: resources should be
 267   // allowed to receive CORS requests.
 268   WebSecurityPolicy::registerURLSchemeAsCORSEnabled(extension_scheme);
 269   WebSecurityPolicy::registerURLSchemeAsCORSEnabled(extension_resource_scheme);
 270
 271   // chrome-extension: resources should bypass Content Security Policy checks
 272   // when included in protected resources.
 273   WebSecurityPolicy::registerURLSchemeAsBypassingContentSecurityPolicy(
 274       extension_scheme);
 275   WebSecurityPolicy::registerURLSchemeAsBypassingContentSecurityPolicy(
 276       extension_resource_scheme);
 277 }
 278
 279 Dispatcher::~Dispatcher() {
 280 }
 281
 282 void Dispatcher::OnRenderFrameCreated(content::RenderFrame* render_frame) {
 283   script_injection_manager_->OnRenderFrameCreated(render_frame);
 284 }
 285
 286 bool Dispatcher::IsExtensionActive(const std::string& extension_id) const {
 287   bool is_active =
 288       active_extension_ids_.find(extension_id) != active_extension_ids_.end();
 289   if (is_active)
 290     CHECK(RendererExtensionRegistry::Get()->Contains(extension_id));
 291   return is_active;
 292 }
 293
 294 void Dispatcher::DidCreateScriptContext(
 295     blink::WebLocalFrame* frame,
 296     const v8::Local<v8::Context>& v8_context,
 297     int extension_group,
 298     int world_id) {
 299   const base::TimeTicks start_time = base::TimeTicks::Now();
 300
 301   ScriptContext* context = script_context_set_->Register(
 302       frame, v8_context, extension_group, world_id);
 303
 304   // Initialize origin permissions for content scripts, which can't be
 305   // initialized in |OnActivateExtension|.
 306   if (context->context_type() == Feature::CONTENT_SCRIPT_CONTEXT)
 307     InitOriginPermissions(context->extension());
 308
 309   {
 310     scoped_ptr<ModuleSystem> module_system(
 311         new ModuleSystem(context, &source_map_));
 312     context->set_module_system(module_system.Pass());
 313   }
 314   ModuleSystem* module_system = context->module_system();
 315
 316   // Enable natives in startup.
 317   ModuleSystem::NativesEnabledScope natives_enabled_scope(module_system);
 318
 319   RegisterNativeHandlers(module_system, context);
 320
 321   // chrome.Event is part of the public API (although undocumented). Make it
 322   // lazily evalulate to Event from event_bindings.js. For extensions only
 323   // though, not all webpages!
 324   if (context->extension()) {
 325     v8::Local<v8::Object> chrome = AsObjectOrEmpty(GetOrCreateChrome(context));
 326     if (!chrome.IsEmpty())
 327       module_system->SetLazyField(chrome, "Event", kEventBindings, "Event");
 328   }
 329
 330   UpdateBindingsForContext(context);
 331
 332   bool is_within_platform_app = IsWithinPlatformApp();
 333   // Inject custom JS into the platform app context.
 334   if (is_within_platform_app) {
 335     module_system->Require("platformApp");
 336   }
 337
 338   RequireGuestViewModules(context);
 339   delegate_->RequireAdditionalModules(context, is_within_platform_app);
 340
 341   const base::TimeDelta elapsed = base::TimeTicks::Now() - start_time;
 342   switch (context->context_type()) {
 343     case Feature::UNSPECIFIED_CONTEXT:
 344       UMA_HISTOGRAM_TIMES("Extensions.DidCreateScriptContext_Unspecified",
 345                           elapsed);
 346       break;
 347     case Feature::BLESSED_EXTENSION_CONTEXT:
 348       UMA_HISTOGRAM_TIMES("Extensions.DidCreateScriptContext_Blessed", elapsed);
 349       break;
 350     case Feature::UNBLESSED_EXTENSION_CONTEXT:
 351       UMA_HISTOGRAM_TIMES("Extensions.DidCreateScriptContext_Unblessed",
 352                           elapsed);
 353       break;
 354     case Feature::CONTENT_SCRIPT_CONTEXT:
 355       UMA_HISTOGRAM_TIMES("Extensions.DidCreateScriptContext_ContentScript",
 356                           elapsed);
 357       break;
 358     case Feature::WEB_PAGE_CONTEXT:
 359       UMA_HISTOGRAM_TIMES("Extensions.DidCreateScriptContext_WebPage", elapsed);
 360       break;
 361     case Feature::BLESSED_WEB_PAGE_CONTEXT:
 362       UMA_HISTOGRAM_TIMES("Extensions.DidCreateScriptContext_BlessedWebPage",
 363                           elapsed);
 364       break;
 365     case Feature::WEBUI_CONTEXT:
 366       UMA_HISTOGRAM_TIMES("Extensions.DidCreateScriptContext_WebUI", elapsed);
 367       break;
 368     case Feature::SERVICE_WORKER_CONTEXT:
 369       // Handled in DidInitializeServiceWorkerContextOnWorkerThread().
 370       NOTREACHED();
 371       break;
 372   }
 373
 374   VLOG(1) << "Num tracked contexts: " << script_context_set_->size();
 375 }
 376
 377 // static
 378 void Dispatcher::DidInitializeServiceWorkerContextOnWorkerThread(
 379     v8::Local<v8::Context> v8_context,
 380     const GURL& url) {
 381   const base::TimeTicks start_time = base::TimeTicks::Now();
 382
 383   const Extension* extension =
 384       RendererExtensionRegistry::Get()->GetExtensionOrAppByURL(url);
 385
 386   if (!extension)
 387     return;
 388
 389   ScriptContext* context = new ScriptContext(
 390       v8_context, nullptr, extension, Feature::SERVICE_WORKER_CONTEXT,
 391       extension, Feature::SERVICE_WORKER_CONTEXT);
 392
 393   g_service_worker_script_context_set.Get().Insert(url,
 394                                                    make_scoped_ptr(context));
 395
 396   v8::Isolate* isolate = context->isolate();
 397
 398   // Fetch the source code for service_worker_bindings.js.
 399   base::StringPiece script_resource =
 400       ResourceBundle::GetSharedInstance().GetRawDataResource(
 401           IDR_SERVICE_WORKER_BINDINGS_JS);
 402   v8::Local<v8::String> script = v8::String::NewExternal(
 403       isolate, new StaticV8ExternalOneByteStringResource(script_resource));
 404
 405   // Run the script to get the main function, then run the main function to
 406   // inject service worker bindings.
 407   v8::Local<v8::Value> result = context->RunScript(
 408       v8_helpers::ToV8StringUnsafe(isolate, "service_worker"), script,
 409       base::Bind(&CrashOnException));
 410   CHECK(result->IsFunction());
 411   v8::Local<v8::Value> args[] = {
 412       v8_helpers::ToV8StringUnsafe(
 413           isolate, BackgroundInfo::GetBackgroundURL(extension).spec()),
 414   };
 415   context->CallFunction(result.As<v8::Function>(), arraysize(args), args);
 416
 417   const base::TimeDelta elapsed = base::TimeTicks::Now() - start_time;
 418   UMA_HISTOGRAM_TIMES(
 419       "Extensions.DidInitializeServiceWorkerContextOnWorkerThread", elapsed);
 420 }
 421
 422 void Dispatcher::WillReleaseScriptContext(
 423     blink::WebLocalFrame* frame,
 424     const v8::Local<v8::Context>& v8_context,
 425     int world_id) {
 426   ScriptContext* context = script_context_set_->GetByV8Context(v8_context);
 427   if (!context)
 428     return;
 429
 430   context->DispatchOnUnloadEvent();
 431   // TODO(kalman): Make |request_sender| use |context->AddInvalidationObserver|.
 432   // In fact |request_sender_| should really be owned by ScriptContext.
 433   request_sender_->InvalidateSource(context);
 434
 435   script_context_set_->Remove(context);
 436   VLOG(1) << "Num tracked contexts: " << script_context_set_->size();
 437 }
 438
 439 // static
 440 void Dispatcher::WillDestroyServiceWorkerContextOnWorkerThread(
 441     const GURL& url) {
 442   if (RendererExtensionRegistry::Get()->GetExtensionOrAppByURL(url))
 443     g_service_worker_script_context_set.Get().Remove(url);
 444 }
 445
 446 void Dispatcher::DidCreateDocumentElement(blink::WebLocalFrame* frame) {
 447   // Note: use GetEffectiveDocumentURL not just frame->document()->url()
 448   // so that this also injects the stylesheet on about:blank frames that
 449   // are hosted in the extension process.
 450   GURL effective_document_url = ScriptContext::GetEffectiveDocumentURL(
 451       frame, frame->document().url(), true /* match_about_blank */);
 452
 453   const Extension* extension =
 454       RendererExtensionRegistry::Get()->GetExtensionOrAppByURL(
 455           effective_document_url);
 456
 457   if (extension &&
 458       (extension->is_extension() || extension->is_platform_app())) {
 459     int resource_id = extension->is_platform_app() ? IDR_PLATFORM_APP_CSS
 460                                                    : IDR_EXTENSION_FONTS_CSS;
 461     std::string stylesheet = ResourceBundle::GetSharedInstance()
 462                                  .GetRawDataResource(resource_id)
 463                                  .as_string();
 464     base::ReplaceFirstSubstringAfterOffset(
 465         &stylesheet, 0, "$FONTFAMILY", system_font_family_);
 466     base::ReplaceFirstSubstringAfterOffset(
 467         &stylesheet, 0, "$FONTSIZE", system_font_size_);
 468
 469     // Blink doesn't let us define an additional user agent stylesheet, so
 470     // we insert the default platform app or extension stylesheet into all
 471     // documents that are loaded in each app or extension.
 472     frame->document().insertStyleSheet(WebString::fromUTF8(stylesheet));
 473   }
 474
 475   // If this is an extension options page, and the extension has opted into
 476   // using Chrome styles, then insert the Chrome extension stylesheet.
 477   if (extension && extension->is_extension() &&
 478       OptionsPageInfo::ShouldUseChromeStyle(extension) &&
 479       effective_document_url == OptionsPageInfo::GetOptionsPage(extension)) {
 480     frame->document().insertStyleSheet(
 481         WebString::fromUTF8(ResourceBundle::GetSharedInstance()
 482                                 .GetRawDataResource(IDR_EXTENSION_CSS)
 483                                 .as_string()));
 484   }
 485
 486   // In testing, the document lifetime events can happen after the render
 487   // process shutdown event.
 488   // See: http://crbug.com/21508 and http://crbug.com/500851
 489   if (content_watcher_) {
 490     content_watcher_->DidCreateDocumentElement(frame);
 491   }
 492 }
 493
 494 void Dispatcher::OnExtensionResponse(int request_id,
 495                                      bool success,
 496                                      const base::ListValue& response,
 497                                      const std::string& error) {
 498   request_sender_->HandleResponse(request_id, success, response, error);
 499 }
 500
 501 void Dispatcher::DispatchEvent(const std::string& extension_id,
 502                                const std::string& event_name) const {
 503   base::ListValue args;
 504   args.Set(0, new base::StringValue(event_name));
 505   args.Set(1, new base::ListValue());
 506
 507   // Needed for Windows compilation, since kEventBindings is declared extern.
 508   const char* local_event_bindings = kEventBindings;
 509   script_context_set_->ForEach(
 510       extension_id, base::Bind(&CallModuleMethod, local_event_bindings,
 511                                kEventDispatchFunction, &args));
 512 }
 513
 514 void Dispatcher::InvokeModuleSystemMethod(content::RenderFrame* render_frame,
 515                                           const std::string& extension_id,
 516                                           const std::string& module_name,
 517                                           const std::string& function_name,
 518                                           const base::ListValue& args,
 519                                           bool user_gesture) {
 520   scoped_ptr<WebScopedUserGesture> web_user_gesture;
 521   if (user_gesture)
 522     web_user_gesture.reset(new WebScopedUserGesture);
 523
 524   script_context_set_->ForEach(
 525       extension_id, render_frame,
 526       base::Bind(&CallModuleMethod, module_name, function_name, &args));
 527
 528   // Reset the idle handler each time there's any activity like event or message
 529   // dispatch, for which Invoke is the chokepoint.
 530   if (set_idle_notifications_) {
 531     RenderThread::Get()->ScheduleIdleHandler(
 532         kInitialExtensionIdleHandlerDelayMs);
 533   }
 534
 535   // Tell the browser process when an event has been dispatched with a lazy
 536   // background page active.
 537   const Extension* extension =
 538       RendererExtensionRegistry::Get()->GetByID(extension_id);
 539   if (extension && BackgroundInfo::HasLazyBackgroundPage(extension) &&
 540       module_name == kEventBindings &&
 541       function_name == kEventDispatchFunction) {
 542     content::RenderFrame* background_frame =
 543         ExtensionFrameHelper::GetBackgroundPageFrame(extension_id);
 544     if (background_frame) {
 545       int message_id;
 546       args.GetInteger(3, &message_id);
 547       background_frame->Send(new ExtensionHostMsg_EventAck(
 548           background_frame->GetRoutingID(), message_id));
 549     }
 550   }
 551 }
 552
 553 void Dispatcher::ClearPortData(int port_id) {
 554   // Only the target port side has entries in |port_to_tab_id_map_|. If
 555   // |port_id| is a source port, std::map::erase() will just silently fail
 556   // here as a no-op.
 557   port_to_tab_id_map_.erase(port_id);
 558 }
 559
 560 // static
 561 std::vector<std::pair<std::string, int> > Dispatcher::GetJsResources() {
 562   std::vector<std::pair<std::string, int> > resources;
 563
 564   // Libraries.
 565   resources.push_back(std::make_pair("appView", IDR_APP_VIEW_JS));
 566   resources.push_back(std::make_pair("entryIdManager", IDR_ENTRY_ID_MANAGER));
 567   resources.push_back(std::make_pair(kEventBindings, IDR_EVENT_BINDINGS_JS));
 568   resources.push_back(std::make_pair("extensionOptions",
 569                                      IDR_EXTENSION_OPTIONS_JS));
 570   resources.push_back(std::make_pair("extensionOptionsAttributes",
 571                                      IDR_EXTENSION_OPTIONS_ATTRIBUTES_JS));
 572   resources.push_back(std::make_pair("extensionOptionsConstants",
 573                                      IDR_EXTENSION_OPTIONS_CONSTANTS_JS));
 574   resources.push_back(std::make_pair("extensionOptionsEvents",
 575                                      IDR_EXTENSION_OPTIONS_EVENTS_JS));
 576   resources.push_back(std::make_pair("extensionView", IDR_EXTENSION_VIEW_JS));
 577   resources.push_back(std::make_pair("extensionViewApiMethods",
 578                                      IDR_EXTENSION_VIEW_API_METHODS_JS));
 579   resources.push_back(std::make_pair("extensionViewAttributes",
 580                                      IDR_EXTENSION_VIEW_ATTRIBUTES_JS));
 581   resources.push_back(std::make_pair("extensionViewConstants",
 582                                      IDR_EXTENSION_VIEW_CONSTANTS_JS));
 583   resources.push_back(std::make_pair("extensionViewEvents",
 584                                      IDR_EXTENSION_VIEW_EVENTS_JS));
 585   resources.push_back(std::make_pair(
 586       "extensionViewInternal", IDR_EXTENSION_VIEW_INTERNAL_CUSTOM_BINDINGS_JS));
 587   resources.push_back(std::make_pair("guestView", IDR_GUEST_VIEW_JS));
 588   resources.push_back(std::make_pair("guestViewAttributes",
 589                                      IDR_GUEST_VIEW_ATTRIBUTES_JS));
 590   resources.push_back(std::make_pair("guestViewContainer",
 591                                      IDR_GUEST_VIEW_CONTAINER_JS));
 592   resources.push_back(std::make_pair("guestViewDeny", IDR_GUEST_VIEW_DENY_JS));
 593   resources.push_back(std::make_pair("guestViewEvents",
 594                                      IDR_GUEST_VIEW_EVENTS_JS));
 595
 596   if (content::BrowserPluginGuestMode::UseCrossProcessFramesForGuests()) {
 597     resources.push_back(std::make_pair("guestViewIframe",
 598                                        IDR_GUEST_VIEW_IFRAME_JS));
 599     resources.push_back(std::make_pair("guestViewIframeContainer",
 600                                        IDR_GUEST_VIEW_IFRAME_CONTAINER_JS));
 601   }
 602
 603   resources.push_back(std::make_pair("imageUtil", IDR_IMAGE_UTIL_JS));
 604   resources.push_back(std::make_pair("json_schema", IDR_JSON_SCHEMA_JS));
 605   resources.push_back(std::make_pair("lastError", IDR_LAST_ERROR_JS));
 606   resources.push_back(std::make_pair("messaging", IDR_MESSAGING_JS));
 607   resources.push_back(std::make_pair("messaging_utils",
 608                                      IDR_MESSAGING_UTILS_JS));
 609   resources.push_back(std::make_pair(kSchemaUtils, IDR_SCHEMA_UTILS_JS));
 610   resources.push_back(std::make_pair("sendRequest", IDR_SEND_REQUEST_JS));
 611   resources.push_back(std::make_pair("setIcon", IDR_SET_ICON_JS));
 612   resources.push_back(std::make_pair("test", IDR_TEST_CUSTOM_BINDINGS_JS));
 613   resources.push_back(
 614       std::make_pair("test_environment_specific_bindings",
 615                      IDR_BROWSER_TEST_ENVIRONMENT_SPECIFIC_BINDINGS_JS));
 616   resources.push_back(std::make_pair("uncaught_exception_handler",
 617                                      IDR_UNCAUGHT_EXCEPTION_HANDLER_JS));
 618   resources.push_back(std::make_pair("unload_event", IDR_UNLOAD_EVENT_JS));
 619   resources.push_back(std::make_pair("utils", IDR_UTILS_JS));
 620   resources.push_back(std::make_pair("webRequest",
 621                                      IDR_WEB_REQUEST_CUSTOM_BINDINGS_JS));
 622   resources.push_back(
 623        std::make_pair("webRequestInternal",
 624                       IDR_WEB_REQUEST_INTERNAL_CUSTOM_BINDINGS_JS));
 625   // Note: webView not webview so that this doesn't interfere with the
 626   // chrome.webview API bindings.
 627   resources.push_back(std::make_pair("webView", IDR_WEB_VIEW_JS));
 628   resources.push_back(std::make_pair("webViewActionRequests",
 629                                      IDR_WEB_VIEW_ACTION_REQUESTS_JS));
 630   resources.push_back(std::make_pair("webViewApiMethods",
 631                                      IDR_WEB_VIEW_API_METHODS_JS));
 632   resources.push_back(std::make_pair("webViewAttributes",
 633                                      IDR_WEB_VIEW_ATTRIBUTES_JS));
 634   resources.push_back(std::make_pair("webViewConstants",
 635                                      IDR_WEB_VIEW_CONSTANTS_JS));
 636   resources.push_back(std::make_pair("webViewEvents", IDR_WEB_VIEW_EVENTS_JS));
 637   resources.push_back(std::make_pair("webViewInternal",
 638                                      IDR_WEB_VIEW_INTERNAL_CUSTOM_BINDINGS_JS));
 639   if (content::BrowserPluginGuestMode::UseCrossProcessFramesForGuests()) {
 640     resources.push_back(std::make_pair("webViewIframe",
 641                                        IDR_WEB_VIEW_IFRAME_JS));
 642   }
 643   resources.push_back(
 644       std::make_pair(mojo::kBindingsModuleName, IDR_MOJO_BINDINGS_JS));
 645   resources.push_back(
 646       std::make_pair(mojo::kBufferModuleName, IDR_MOJO_BUFFER_JS));
 647   resources.push_back(
 648       std::make_pair(mojo::kCodecModuleName, IDR_MOJO_CODEC_JS));
 649   resources.push_back(
 650       std::make_pair(mojo::kConnectionModuleName, IDR_MOJO_CONNECTION_JS));
 651   resources.push_back(
 652       std::make_pair(mojo::kConnectorModuleName, IDR_MOJO_CONNECTOR_JS));
 653   resources.push_back(
 654       std::make_pair(mojo::kRouterModuleName, IDR_MOJO_ROUTER_JS));
 655   resources.push_back(
 656       std::make_pair(mojo::kUnicodeModuleName, IDR_MOJO_UNICODE_JS));
 657   resources.push_back(
 658       std::make_pair(mojo::kValidatorModuleName, IDR_MOJO_VALIDATOR_JS));
 659   resources.push_back(std::make_pair("async_waiter", IDR_ASYNC_WAITER_JS));
 660   resources.push_back(std::make_pair("data_receiver", IDR_DATA_RECEIVER_JS));
 661   resources.push_back(std::make_pair("data_sender", IDR_DATA_SENDER_JS));
 662   resources.push_back(std::make_pair("keep_alive", IDR_KEEP_ALIVE_JS));
 663   resources.push_back(std::make_pair("extensions/common/mojo/keep_alive.mojom",
 664                                      IDR_KEEP_ALIVE_MOJOM_JS));
 665   resources.push_back(std::make_pair("device/serial/data_stream.mojom",
 666                                      IDR_DATA_STREAM_MOJOM_JS));
 667   resources.push_back(
 668       std::make_pair("device/serial/data_stream_serialization.mojom",
 669                      IDR_DATA_STREAM_SERIALIZATION_MOJOM_JS));
 670   resources.push_back(std::make_pair("stash_client", IDR_STASH_CLIENT_JS));
 671   resources.push_back(
 672       std::make_pair("extensions/common/mojo/stash.mojom", IDR_STASH_MOJOM_JS));
 673
 674   // Custom bindings.
 675   resources.push_back(
 676       std::make_pair("app.runtime", IDR_APP_RUNTIME_CUSTOM_BINDINGS_JS));
 677   resources.push_back(
 678       std::make_pair("app.window", IDR_APP_WINDOW_CUSTOM_BINDINGS_JS));
 679   resources.push_back(
 680       std::make_pair("declarativeWebRequest",
 681                      IDR_DECLARATIVE_WEBREQUEST_CUSTOM_BINDINGS_JS));
 682   resources.push_back(
 683       std::make_pair("contextMenus", IDR_CONTEXT_MENUS_CUSTOM_BINDINGS_JS));
 684   resources.push_back(
 685       std::make_pair("contextMenusHandlers", IDR_CONTEXT_MENUS_HANDLERS_JS));
 686   resources.push_back(
 687       std::make_pair("extension", IDR_EXTENSION_CUSTOM_BINDINGS_JS));
 688   resources.push_back(std::make_pair("i18n", IDR_I18N_CUSTOM_BINDINGS_JS));
 689   resources.push_back(std::make_pair(
 690       "mimeHandlerPrivate", IDR_MIME_HANDLER_PRIVATE_CUSTOM_BINDINGS_JS));
 691   resources.push_back(std::make_pair("extensions/common/api/mime_handler.mojom",
 692                                      IDR_MIME_HANDLER_MOJOM_JS));
 693   resources.push_back(
 694       std::make_pair("mojoPrivate", IDR_MOJO_PRIVATE_CUSTOM_BINDINGS_JS));
 695   resources.push_back(
 696       std::make_pair("permissions", IDR_PERMISSIONS_CUSTOM_BINDINGS_JS));
 697   resources.push_back(std::make_pair("printerProvider",
 698                                      IDR_PRINTER_PROVIDER_CUSTOM_BINDINGS_JS));
 699   resources.push_back(
 700       std::make_pair("runtime", IDR_RUNTIME_CUSTOM_BINDINGS_JS));
 701   resources.push_back(std::make_pair("windowControls", IDR_WINDOW_CONTROLS_JS));
 702   resources.push_back(
 703       std::make_pair("webViewRequest",
 704                      IDR_WEB_VIEW_REQUEST_CUSTOM_BINDINGS_JS));
 705   resources.push_back(std::make_pair("binding", IDR_BINDING_JS));
 706
 707   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
 708           switches::kEnableMojoSerialService)) {
 709     resources.push_back(
 710         std::make_pair("serial", IDR_SERIAL_CUSTOM_BINDINGS_JS));
 711   }
 712   resources.push_back(std::make_pair("serial_service", IDR_SERIAL_SERVICE_JS));
 713   resources.push_back(
 714       std::make_pair("device/serial/serial.mojom", IDR_SERIAL_MOJOM_JS));
 715   resources.push_back(std::make_pair("device/serial/serial_serialization.mojom",
 716                                      IDR_SERIAL_SERIALIZATION_MOJOM_JS));
 717
 718   // Custom types sources.
 719   resources.push_back(std::make_pair("StorageArea", IDR_STORAGE_AREA_JS));
 720
 721   // Platform app sources that are not API-specific..
 722   resources.push_back(std::make_pair("platformApp", IDR_PLATFORM_APP_JS));
 723
 724 #if defined(ENABLE_MEDIA_ROUTER)
 725   resources.push_back(
 726       std::make_pair("chrome/browser/media/router/media_router.mojom",
 727                      IDR_MEDIA_ROUTER_MOJOM_JS));
 728   resources.push_back(
 729       std::make_pair("media_router_bindings", IDR_MEDIA_ROUTER_BINDINGS_JS));
 730 #endif  // defined(ENABLE_MEDIA_ROUTER)
 731
 732   return resources;
 733 }
 734
 735 // NOTE: please use the naming convention "foo_natives" for these.
 736 // static
 737 void Dispatcher::RegisterNativeHandlers(ModuleSystem* module_system,
 738                                         ScriptContext* context,
 739                                         Dispatcher* dispatcher,
 740                                         RequestSender* request_sender,
 741                                         V8SchemaRegistry* v8_schema_registry) {
 742   module_system->RegisterNativeHandler(
 743       "chrome", scoped_ptr<NativeHandler>(new ChromeNativeHandler(context)));
 744   module_system->RegisterNativeHandler(
 745       "lazy_background_page",
 746       scoped_ptr<NativeHandler>(new LazyBackgroundPageNativeHandler(context)));
 747   module_system->RegisterNativeHandler(
 748       "logging", scoped_ptr<NativeHandler>(new LoggingNativeHandler(context)));
 749   module_system->RegisterNativeHandler("schema_registry",
 750                                        v8_schema_registry->AsNativeHandler());
 751   module_system->RegisterNativeHandler(
 752       "print", scoped_ptr<NativeHandler>(new PrintNativeHandler(context)));
 753   module_system->RegisterNativeHandler(
 754       "test_features",
 755       scoped_ptr<NativeHandler>(new TestFeaturesNativeHandler(context)));
 756   module_system->RegisterNativeHandler(
 757       "test_native_handler",
 758       scoped_ptr<NativeHandler>(new TestNativeHandler(context)));
 759   module_system->RegisterNativeHandler(
 760       "user_gestures",
 761       scoped_ptr<NativeHandler>(new UserGesturesNativeHandler(context)));
 762   module_system->RegisterNativeHandler(
 763       "utils", scoped_ptr<NativeHandler>(new UtilsNativeHandler(context)));
 764   module_system->RegisterNativeHandler(
 765       "v8_context",
 766       scoped_ptr<NativeHandler>(
 767           new V8ContextNativeHandler(context, dispatcher)));
 768   module_system->RegisterNativeHandler(
 769       "event_natives", scoped_ptr<NativeHandler>(new EventBindings(context)));
 770   module_system->RegisterNativeHandler(
 771       "messaging_natives",
 772       scoped_ptr<NativeHandler>(MessagingBindings::Get(dispatcher, context)));
 773   module_system->RegisterNativeHandler(
 774       "apiDefinitions",
 775       scoped_ptr<NativeHandler>(
 776           new ApiDefinitionsNatives(dispatcher, context)));
 777   module_system->RegisterNativeHandler(
 778       "sendRequest",
 779       scoped_ptr<NativeHandler>(
 780           new SendRequestNatives(request_sender, context)));
 781   module_system->RegisterNativeHandler(
 782       "setIcon",
 783       scoped_ptr<NativeHandler>(new SetIconNatives(context)));
 784   module_system->RegisterNativeHandler(
 785       "activityLogger",
 786       scoped_ptr<NativeHandler>(new APIActivityLogger(context)));
 787   module_system->RegisterNativeHandler(
 788       "renderFrameObserverNatives",
 789       scoped_ptr<NativeHandler>(new RenderFrameObserverNatives(context)));
 790
 791   // Natives used by multiple APIs.
 792   module_system->RegisterNativeHandler(
 793       "file_system_natives",
 794       scoped_ptr<NativeHandler>(new FileSystemNatives(context)));
 795
 796   // Custom bindings.
 797   // |dispatcher| is null in unit tests.
 798   const ScriptContextSet* script_context_set = dispatcher ?
 799       &dispatcher->script_context_set() : nullptr;
 800   module_system->RegisterNativeHandler(
 801       "app_window_natives",
 802       scoped_ptr<NativeHandler>(new AppWindowCustomBindings(
 803           script_context_set, context)));
 804   module_system->RegisterNativeHandler(
 805       "blob_natives",
 806       scoped_ptr<NativeHandler>(new BlobNativeHandler(context)));
 807   module_system->RegisterNativeHandler(
 808       "context_menus",
 809       scoped_ptr<NativeHandler>(new ContextMenusCustomBindings(context)));
 810   module_system->RegisterNativeHandler(
 811       "css_natives", scoped_ptr<NativeHandler>(new CssNativeHandler(context)));
 812   module_system->RegisterNativeHandler(
 813       "document_natives",
 814       scoped_ptr<NativeHandler>(new DocumentCustomBindings(context)));
 815   module_system->RegisterNativeHandler(
 816       "guest_view_internal",
 817       scoped_ptr<NativeHandler>(
 818           new GuestViewInternalCustomBindings(context)));
 819   module_system->RegisterNativeHandler(
 820       "i18n", scoped_ptr<NativeHandler>(new I18NCustomBindings(context)));
 821   module_system->RegisterNativeHandler(
 822       "id_generator",
 823       scoped_ptr<NativeHandler>(new IdGeneratorCustomBindings(context)));
 824   module_system->RegisterNativeHandler(
 825       "runtime", scoped_ptr<NativeHandler>(new RuntimeCustomBindings(context)));
 826 }
 827
 828 bool Dispatcher::OnControlMessageReceived(const IPC::Message& message) {
 829   bool handled = true;
 830   IPC_BEGIN_MESSAGE_MAP(Dispatcher, message)
 831   IPC_MESSAGE_HANDLER(ExtensionMsg_ActivateExtension, OnActivateExtension)
 832   IPC_MESSAGE_HANDLER(ExtensionMsg_CancelSuspend, OnCancelSuspend)
 833   IPC_MESSAGE_HANDLER(ExtensionMsg_DeliverMessage, OnDeliverMessage)
 834   IPC_MESSAGE_HANDLER(ExtensionMsg_DispatchOnConnect, OnDispatchOnConnect)
 835   IPC_MESSAGE_HANDLER(ExtensionMsg_DispatchOnDisconnect, OnDispatchOnDisconnect)
 836   IPC_MESSAGE_HANDLER(ExtensionMsg_Loaded, OnLoaded)
 837   IPC_MESSAGE_HANDLER(ExtensionMsg_MessageInvoke, OnMessageInvoke)
 838   IPC_MESSAGE_HANDLER(ExtensionMsg_SetChannel, OnSetChannel)
 839   IPC_MESSAGE_HANDLER(ExtensionMsg_SetFunctionNames, OnSetFunctionNames)
 840   IPC_MESSAGE_HANDLER(ExtensionMsg_SetScriptingWhitelist,
 841                       OnSetScriptingWhitelist)
 842   IPC_MESSAGE_HANDLER(ExtensionMsg_SetSystemFont, OnSetSystemFont)
 843   IPC_MESSAGE_HANDLER(ExtensionMsg_ShouldSuspend, OnShouldSuspend)
 844   IPC_MESSAGE_HANDLER(ExtensionMsg_Suspend, OnSuspend)
 845   IPC_MESSAGE_HANDLER(ExtensionMsg_TransferBlobs, OnTransferBlobs)
 846   IPC_MESSAGE_HANDLER(ExtensionMsg_Unloaded, OnUnloaded)
 847   IPC_MESSAGE_HANDLER(ExtensionMsg_UpdatePermissions, OnUpdatePermissions)
 848   IPC_MESSAGE_HANDLER(ExtensionMsg_UpdateTabSpecificPermissions,
 849                       OnUpdateTabSpecificPermissions)
 850   IPC_MESSAGE_HANDLER(ExtensionMsg_ClearTabSpecificPermissions,
 851                       OnClearTabSpecificPermissions)
 852   IPC_MESSAGE_HANDLER(ExtensionMsg_UsingWebRequestAPI, OnUsingWebRequestAPI)
 853   IPC_MESSAGE_FORWARD(ExtensionMsg_WatchPages,
 854                       content_watcher_.get(),
 855                       ContentWatcher::OnWatchPages)
 856   IPC_MESSAGE_UNHANDLED(handled = false)
 857   IPC_END_MESSAGE_MAP()
 858
 859   return handled;
 860 }
 861
 862 void Dispatcher::WebKitInitialized() {
 863   RenderThread::Get()->RegisterExtension(SafeBuiltins::CreateV8Extension());
 864
 865   // For extensions, we want to ensure we call the IdleHandler every so often,
 866   // even if the extension keeps up activity.
 867   if (set_idle_notifications_) {
 868     forced_idle_timer_.reset(new base::RepeatingTimer<content::RenderThread>);
 869     forced_idle_timer_->Start(
 870         FROM_HERE,
 871         base::TimeDelta::FromMilliseconds(kMaxExtensionIdleHandlerDelayMs),
 872         RenderThread::Get(),
 873         &RenderThread::IdleHandler);
 874   }
 875
 876   // Initialize host permissions for any extensions that were activated before
 877   // WebKit was initialized.
 878   for (const std::string& extension_id : active_extension_ids_) {
 879     const Extension* extension =
 880         RendererExtensionRegistry::Get()->GetByID(extension_id);
 881     CHECK(extension);
 882     InitOriginPermissions(extension);
 883   }
 884
 885   EnableCustomElementWhiteList();
 886
 887   is_webkit_initialized_ = true;
 888 }
 889
 890 void Dispatcher::IdleNotification() {
 891   if (set_idle_notifications_ && forced_idle_timer_) {
 892     // Dampen the forced delay as well if the extension stays idle for long
 893     // periods of time. (forced_idle_timer_ can be NULL after
 894     // OnRenderProcessShutdown has been called.)
 895     int64 forced_delay_ms =
 896         std::max(RenderThread::Get()->GetIdleNotificationDelayInMs(),
 897                  kMaxExtensionIdleHandlerDelayMs);
 898     forced_idle_timer_->Stop();
 899     forced_idle_timer_->Start(
 900         FROM_HERE,
 901         base::TimeDelta::FromMilliseconds(forced_delay_ms),
 902         RenderThread::Get(),
 903         &RenderThread::IdleHandler);
 904   }
 905 }
 906
 907 void Dispatcher::OnRenderProcessShutdown() {
 908   v8_schema_registry_.reset();
 909   forced_idle_timer_.reset();
 910   content_watcher_.reset();
 911 }
 912
 913 void Dispatcher::OnActivateExtension(const std::string& extension_id) {
 914   const Extension* extension =
 915       RendererExtensionRegistry::Get()->GetByID(extension_id);
 916   if (!extension) {
 917     // Extension was activated but was never loaded. This probably means that
 918     // the renderer failed to load it (or the browser failed to tell us when it
 919     // did). Failures shouldn't happen, but instead of crashing there (which
 920     // executes on all renderers) be conservative and only crash in the renderer
 921     // of the extension which failed to load; this one.
 922     std::string& error = extension_load_errors_[extension_id];
 923     char minidump[256];
 924     base::debug::Alias(&minidump);
 925     base::snprintf(minidump,
 926                    arraysize(minidump),
 927                    "e::dispatcher:%s:%s",
 928                    extension_id.c_str(),
 929                    error.c_str());
 930     LOG(FATAL) << extension_id << " was never loaded: " << error;
 931   }
 932
 933   active_extension_ids_.insert(extension_id);
 934
 935   // This is called when starting a new extension page, so start the idle
 936   // handler ticking.
 937   RenderThread::Get()->ScheduleIdleHandler(kInitialExtensionIdleHandlerDelayMs);
 938
 939   if (is_webkit_initialized_) {
 940     DOMActivityLogger::AttachToWorld(
 941         DOMActivityLogger::kMainWorldId, extension_id);
 942
 943     InitOriginPermissions(extension);
 944   }
 945
 946   UpdateActiveExtensions();
 947 }
 948
 949 void Dispatcher::OnCancelSuspend(const std::string& extension_id) {
 950   DispatchEvent(extension_id, kOnSuspendCanceledEvent);
 951 }
 952
 953 void Dispatcher::OnDeliverMessage(int target_port_id, const Message& message) {
 954   scoped_ptr<RequestSender::ScopedTabID> scoped_tab_id;
 955   std::map<int, int>::const_iterator it =
 956       port_to_tab_id_map_.find(target_port_id);
 957   if (it != port_to_tab_id_map_.end()) {
 958     scoped_tab_id.reset(
 959         new RequestSender::ScopedTabID(request_sender(), it->second));
 960   }
 961
 962   MessagingBindings::DeliverMessage(*script_context_set_, target_port_id,
 963                                     message,
 964                                     NULL);  // All render frames.
 965 }
 966
 967 void Dispatcher::OnDispatchOnConnect(
 968     int target_port_id,
 969     const std::string& channel_name,
 970     const ExtensionMsg_TabConnectionInfo& source,
 971     const ExtensionMsg_ExternalConnectionInfo& info,
 972     const std::string& tls_channel_id) {
 973   DCHECK(!ContainsKey(port_to_tab_id_map_, target_port_id));
 974   DCHECK_EQ(1, target_port_id % 2);  // target renderer ports have odd IDs.
 975   int sender_tab_id = -1;
 976   source.tab.GetInteger("id", &sender_tab_id);
 977   port_to_tab_id_map_[target_port_id] = sender_tab_id;
 978
 979   MessagingBindings::DispatchOnConnect(*script_context_set_, target_port_id,
 980                                        channel_name, source, info,
 981                                        tls_channel_id,
 982                                        NULL);  // All render frames.
 983 }
 984
 985 void Dispatcher::OnDispatchOnDisconnect(int port_id,
 986                                         const std::string& error_message) {
 987   MessagingBindings::DispatchOnDisconnect(*script_context_set_, port_id,
 988                                           error_message,
 989                                           NULL);  // All render frames.
 990 }
 991
 992 void Dispatcher::OnLoaded(
 993     const std::vector<ExtensionMsg_Loaded_Params>& loaded_extensions) {
 994   for (const auto& param : loaded_extensions) {
 995     std::string error;
 996     scoped_refptr<const Extension> extension = param.ConvertToExtension(&error);
 997     if (!extension.get()) {
 998       NOTREACHED() << error;
 999       // Note: in tests |param.id| has been observed to be empty (see comment
1000       // just below) so this isn't all that reliable.
1001       extension_load_errors_[param.id] = error;
1002       continue;
1003     }
1004
1005     RendererExtensionRegistry* extension_registry =
1006         RendererExtensionRegistry::Get();
1007     // TODO(kalman): This test is deliberately not a CHECK (though I wish it
1008     // could be) and uses extension->id() not params.id:
1009     // 1. For some reason params.id can be empty. I've only seen it with
1010     //    the webstore extension, in tests, and I've spent some time trying to
1011     //    figure out why - but cost/benefit won.
1012     // 2. The browser only sends this IPC to RenderProcessHosts once, but the
1013     //    Dispatcher is attached to a RenderThread. Presumably there is a
1014     //    mismatch there. In theory one would think it's possible for the
1015     //    browser to figure this out itself - but again, cost/benefit.
1016     if (!extension_registry->Contains(extension->id()))
1017       extension_registry->Insert(extension);
1018   }
1019
1020   // Update the available bindings for all contexts. These may have changed if
1021   // an externally_connectable extension was loaded that can connect to an
1022   // open webpage.
1023   UpdateBindings("");
1024 }
1025
1026 void Dispatcher::OnMessageInvoke(const std::string& extension_id,
1027                                  const std::string& module_name,
1028                                  const std::string& function_name,
1029                                  const base::ListValue& args,
1030                                  bool user_gesture) {
1031   InvokeModuleSystemMethod(
1032       NULL, extension_id, module_name, function_name, args, user_gesture);
1033 }
1034
1035 void Dispatcher::OnSetChannel(int channel) {
1036   delegate_->SetChannel(channel);
1037   AddChannelSpecificFeatures();
1038 }
1039
1040 void Dispatcher::OnSetFunctionNames(const std::vector<std::string>& names) {
1041   function_names_.clear();
1042   for (size_t i = 0; i < names.size(); ++i)
1043     function_names_.insert(names[i]);
1044 }
1045
1046 void Dispatcher::OnSetScriptingWhitelist(
1047     const ExtensionsClient::ScriptingWhitelist& extension_ids) {
1048   ExtensionsClient::Get()->SetScriptingWhitelist(extension_ids);
1049 }
1050
1051 void Dispatcher::OnSetSystemFont(const std::string& font_family,
1052                                  const std::string& font_size) {
1053   system_font_family_ = font_family;
1054   system_font_size_ = font_size;
1055 }
1056
1057 void Dispatcher::OnShouldSuspend(const std::string& extension_id,
1058                                  uint64 sequence_id) {
1059   RenderThread::Get()->Send(
1060       new ExtensionHostMsg_ShouldSuspendAck(extension_id, sequence_id));
1061 }
1062
1063 void Dispatcher::OnSuspend(const std::string& extension_id) {
1064   // Dispatch the suspend event. This doesn't go through the standard event
1065   // dispatch machinery because it requires special handling. We need to let
1066   // the browser know when we are starting and stopping the event dispatch, so
1067   // that it still considers the extension idle despite any activity the suspend
1068   // event creates.
1069   DispatchEvent(extension_id, kOnSuspendEvent);
1070   RenderThread::Get()->Send(new ExtensionHostMsg_SuspendAck(extension_id));
1071 }
1072
1073 void Dispatcher::OnTransferBlobs(const std::vector<std::string>& blob_uuids) {
1074   RenderThread::Get()->Send(new ExtensionHostMsg_TransferBlobsAck(blob_uuids));
1075 }
1076
1077 void Dispatcher::OnUnloaded(const std::string& id) {
1078   // See comment in OnLoaded for why it would be nice, but perhaps incorrect,
1079   // to CHECK here rather than guarding.
1080   if (!RendererExtensionRegistry::Get()->Remove(id))
1081     return;
1082
1083   active_extension_ids_.erase(id);
1084
1085   script_injection_manager_->OnExtensionUnloaded(id);
1086
1087   // If the extension is later reloaded with a different set of permissions,
1088   // we'd like it to get a new isolated world ID, so that it can pick up the
1089   // changed origin whitelist.
1090   ScriptInjection::RemoveIsolatedWorld(id);
1091
1092   // Invalidate all of the contexts that were removed.
1093   // TODO(kalman): add an invalidation observer interface to ScriptContext.
1094   std::set<ScriptContext*> removed_contexts =
1095       script_context_set_->OnExtensionUnloaded(id);
1096   for (ScriptContext* context : removed_contexts) {
1097     request_sender_->InvalidateSource(context);
1098   }
1099
1100   // Update the available bindings for the remaining contexts. These may have
1101   // changed if an externally_connectable extension is unloaded and a webpage
1102   // is no longer accessible.
1103   UpdateBindings("");
1104
1105   // Invalidates the messages map for the extension in case the extension is
1106   // reloaded with a new messages map.
1107   EraseL10nMessagesMap(id);
1108
1109   // We don't do anything with existing platform-app stylesheets. They will
1110   // stay resident, but the URL pattern corresponding to the unloaded
1111   // extension's URL just won't match anything anymore.
1112 }
1113
1114 void Dispatcher::OnUpdatePermissions(
1115     const ExtensionMsg_UpdatePermissions_Params& params) {
1116   const Extension* extension =
1117       RendererExtensionRegistry::Get()->GetByID(params.extension_id);
1118   if (!extension)
1119     return;
1120
1121   scoped_refptr<const PermissionSet> active =
1122       params.active_permissions.ToPermissionSet();
1123   scoped_refptr<const PermissionSet> withheld =
1124       params.withheld_permissions.ToPermissionSet();
1125
1126   if (is_webkit_initialized_) {
1127     UpdateOriginPermissions(
1128         extension->url(),
1129         extension->permissions_data()->GetEffectiveHostPermissions(),
1130         active->effective_hosts());
1131   }
1132
1133   extension->permissions_data()->SetPermissions(active, withheld);
1134   UpdateBindings(extension->id());
1135 }
1136
1137 void Dispatcher::OnUpdateTabSpecificPermissions(const GURL& visible_url,
1138                                                 const std::string& extension_id,
1139                                                 const URLPatternSet& new_hosts,
1140                                                 bool update_origin_whitelist,
1141                                                 int tab_id) {
1142   const Extension* extension =
1143       RendererExtensionRegistry::Get()->GetByID(extension_id);
1144   if (!extension)
1145     return;
1146
1147   URLPatternSet old_effective =
1148       extension->permissions_data()->GetEffectiveHostPermissions();
1149   extension->permissions_data()->UpdateTabSpecificPermissions(
1150       tab_id,
1151       new extensions::PermissionSet(extensions::APIPermissionSet(),
1152                                     extensions::ManifestPermissionSet(),
1153                                     new_hosts,
1154                                     extensions::URLPatternSet()));
1155
1156   if (is_webkit_initialized_ && update_origin_whitelist) {
1157     UpdateOriginPermissions(
1158         extension->url(),
1159         old_effective,
1160         extension->permissions_data()->GetEffectiveHostPermissions());
1161   }
1162 }
1163
1164 void Dispatcher::OnClearTabSpecificPermissions(
1165     const std::vector<std::string>& extension_ids,
1166     bool update_origin_whitelist,
1167     int tab_id) {
1168   for (const std::string& id : extension_ids) {
1169     const Extension* extension = RendererExtensionRegistry::Get()->GetByID(id);
1170     if (extension) {
1171       URLPatternSet old_effective =
1172           extension->permissions_data()->GetEffectiveHostPermissions();
1173       extension->permissions_data()->ClearTabSpecificPermissions(tab_id);
1174       if (is_webkit_initialized_ && update_origin_whitelist) {
1175         UpdateOriginPermissions(
1176             extension->url(),
1177             old_effective,
1178             extension->permissions_data()->GetEffectiveHostPermissions());
1179       }
1180     }
1181   }
1182 }
1183
1184 void Dispatcher::OnUsingWebRequestAPI(bool webrequest_used) {
1185   webrequest_used_ = webrequest_used;
1186 }
1187
1188 void Dispatcher::OnUserScriptsUpdated(const std::set<HostID>& changed_hosts,
1189                                       const std::vector<UserScript*>& scripts) {
1190   UpdateActiveExtensions();
1191 }
1192
1193 void Dispatcher::UpdateActiveExtensions() {
1194   std::set<std::string> active_extensions = active_extension_ids_;
1195   user_script_set_manager_->GetAllActiveExtensionIds(&active_extensions);
1196   delegate_->OnActiveExtensionsUpdated(active_extensions);
1197 }
1198
1199 void Dispatcher::InitOriginPermissions(const Extension* extension) {
1200   delegate_->InitOriginPermissions(extension,
1201                                    IsExtensionActive(extension->id()));
1202   UpdateOriginPermissions(
1203       extension->url(),
1204       URLPatternSet(),  // No old permissions.
1205       extension->permissions_data()->GetEffectiveHostPermissions());
1206 }
1207
1208 void Dispatcher::UpdateOriginPermissions(const GURL& extension_url,
1209                                          const URLPatternSet& old_patterns,
1210                                          const URLPatternSet& new_patterns) {
1211   static const char* kSchemes[] = {
1212     url::kHttpScheme,
1213     url::kHttpsScheme,
1214     url::kFileScheme,
1215     content::kChromeUIScheme,
1216     url::kFtpScheme,
1217 #if defined(OS_CHROMEOS)
1218     content::kExternalFileScheme,
1219 #endif
1220     extensions::kExtensionScheme,
1221   };
1222   for (size_t i = 0; i < arraysize(kSchemes); ++i) {
1223     const char* scheme = kSchemes[i];
1224     // Remove all old patterns...
1225     for (URLPatternSet::const_iterator pattern = old_patterns.begin();
1226          pattern != old_patterns.end(); ++pattern) {
1227       if (pattern->MatchesScheme(scheme)) {
1228         WebSecurityPolicy::removeOriginAccessWhitelistEntry(
1229             extension_url,
1230             WebString::fromUTF8(scheme),
1231             WebString::fromUTF8(pattern->host()),
1232             pattern->match_subdomains());
1233       }
1234     }
1235     // ...And add the new ones.
1236     for (URLPatternSet::const_iterator pattern = new_patterns.begin();
1237          pattern != new_patterns.end(); ++pattern) {
1238       if (pattern->MatchesScheme(scheme)) {
1239         WebSecurityPolicy::addOriginAccessWhitelistEntry(
1240             extension_url,
1241             WebString::fromUTF8(scheme),
1242             WebString::fromUTF8(pattern->host()),
1243             pattern->match_subdomains());
1244       }
1245     }
1246   }
1247 }
1248
1249 void Dispatcher::EnableCustomElementWhiteList() {
1250   blink::WebCustomElement::addEmbedderCustomElementName("appview");
1251   blink::WebCustomElement::addEmbedderCustomElementName("appviewbrowserplugin");
1252   blink::WebCustomElement::addEmbedderCustomElementName("extensionoptions");
1253   blink::WebCustomElement::addEmbedderCustomElementName(
1254       "extensionoptionsbrowserplugin");
1255   blink::WebCustomElement::addEmbedderCustomElementName("extensionview");
1256   blink::WebCustomElement::addEmbedderCustomElementName(
1257       "extensionviewbrowserplugin");
1258   blink::WebCustomElement::addEmbedderCustomElementName("webview");
1259   blink::WebCustomElement::addEmbedderCustomElementName("webviewbrowserplugin");
1260 }
1261
1262 void Dispatcher::UpdateBindings(const std::string& extension_id) {
1263   script_context_set().ForEach(extension_id,
1264                                base::Bind(&Dispatcher::UpdateBindingsForContext,
1265                                           base::Unretained(this)));
1266 }
1267
1268 void Dispatcher::UpdateBindingsForContext(ScriptContext* context) {
1269   v8::HandleScope handle_scope(context->isolate());
1270   v8::Context::Scope context_scope(context->v8_context());
1271
1272   // TODO(kalman): Make the bindings registration have zero overhead then run
1273   // the same code regardless of context type.
1274   switch (context->context_type()) {
1275     case Feature::UNSPECIFIED_CONTEXT:
1276     case Feature::WEB_PAGE_CONTEXT:
1277     case Feature::BLESSED_WEB_PAGE_CONTEXT:
1278       // Hard-code registration of any APIs that are exposed to webpage-like
1279       // contexts, because it's too expensive to run the full bindings code.
1280       // All of the same permission checks will still apply.
1281       if (context->GetAvailability("app").is_available())
1282         RegisterBinding("app", context);
1283       if (context->GetAvailability("webstore").is_available())
1284         RegisterBinding("webstore", context);
1285       if (context->GetAvailability("dashboardPrivate").is_available())
1286         RegisterBinding("dashboardPrivate", context);
1287       if (IsRuntimeAvailableToContext(context))
1288         RegisterBinding("runtime", context);
1289       UpdateContentCapabilities(context);
1290       break;
1291
1292     case Feature::BLESSED_EXTENSION_CONTEXT:
1293     case Feature::UNBLESSED_EXTENSION_CONTEXT:
1294     case Feature::CONTENT_SCRIPT_CONTEXT:
1295     case Feature::WEBUI_CONTEXT: {
1296       // Extension context; iterate through all the APIs and bind the available
1297       // ones.
1298       const FeatureProvider* api_feature_provider =
1299           FeatureProvider::GetAPIFeatures();
1300       const std::vector<std::string>& apis =
1301           api_feature_provider->GetAllFeatureNames();
1302       for (const std::string& api_name : apis) {
1303         Feature* feature = api_feature_provider->GetFeature(api_name);
1304         DCHECK(feature);
1305
1306         // Internal APIs are included via require(api_name) from internal code
1307         // rather than chrome[api_name].
1308         if (feature->IsInternal())
1309           continue;
1310
1311         // If this API has a parent feature (and isn't marked 'noparent'),
1312         // then this must be a function or event, so we should not register.
1313         if (api_feature_provider->GetParent(feature) != NULL)
1314           continue;
1315
1316         // Skip chrome.test if this isn't a test.
1317         if (api_name == "test" &&
1318             !base::CommandLine::ForCurrentProcess()->HasSwitch(
1319                 ::switches::kTestType)) {
1320           continue;
1321         }
1322
1323         if (context->IsAnyFeatureAvailableToContext(*feature))
1324           RegisterBinding(api_name, context);
1325       }
1326       break;
1327     }
1328     case Feature::SERVICE_WORKER_CONTEXT:
1329       // Handled in DidInitializeServiceWorkerContextOnWorkerThread().
1330       NOTREACHED();
1331       break;
1332   }
1333 }
1334
1335 void Dispatcher::RegisterBinding(const std::string& api_name,
1336                                  ScriptContext* context) {
1337   std::string bind_name;
1338   v8::Local<v8::Object> bind_object =
1339       GetOrCreateBindObjectIfAvailable(api_name, &bind_name, context);
1340
1341   // Empty if the bind object failed to be created, probably because the
1342   // extension overrode chrome with a non-object, e.g. window.chrome = true.
1343   if (bind_object.IsEmpty())
1344     return;
1345
1346   v8::Local<v8::String> v8_bind_name =
1347       v8::String::NewFromUtf8(context->isolate(), bind_name.c_str());
1348   if (bind_object->HasRealNamedProperty(v8_bind_name)) {
1349     // The bind object may already have the property if the API has been
1350     // registered before (or if the extension has put something there already,
1351     // but, whatevs).
1352     //
1353     // In the former case, we need to re-register the bindings for the APIs
1354     // which the extension now has permissions for (if any), but not touch any
1355     // others so that we don't destroy state such as event listeners.
1356     //
1357     // TODO(kalman): Only register available APIs to make this all moot.
1358     if (bind_object->HasRealNamedCallbackProperty(v8_bind_name))
1359       return;  // lazy binding still there, nothing to do
1360     if (bind_object->Get(v8_bind_name)->IsObject())
1361       return;  // binding has already been fully installed
1362   }
1363
1364   ModuleSystem* module_system = context->module_system();
1365   if (!source_map_.Contains(api_name)) {
1366     module_system->RegisterNativeHandler(
1367         api_name,
1368         scoped_ptr<NativeHandler>(new BindingGeneratingNativeHandler(
1369             context, api_name, "binding")));
1370     module_system->SetNativeLazyField(
1371         bind_object, bind_name, api_name, "binding");
1372   } else {
1373     module_system->SetLazyField(bind_object, bind_name, api_name, "binding");
1374   }
1375 }
1376
1377 // NOTE: please use the naming convention "foo_natives" for these.
1378 void Dispatcher::RegisterNativeHandlers(ModuleSystem* module_system,
1379                                         ScriptContext* context) {
1380   RegisterNativeHandlers(module_system,
1381                          context,
1382                          this,
1383                          request_sender_.get(),
1384                          v8_schema_registry_.get());
1385   const Extension* extension = context->extension();
1386   int manifest_version = extension ? extension->manifest_version() : 1;
1387   bool is_component_extension =
1388       extension && Manifest::IsComponentLocation(extension->location());
1389   bool send_request_disabled =
1390       (extension && Manifest::IsUnpackedLocation(extension->location()) &&
1391        BackgroundInfo::HasLazyBackgroundPage(extension));
1392   module_system->RegisterNativeHandler(
1393       "process",
1394       scoped_ptr<NativeHandler>(new ProcessInfoNativeHandler(
1395           context,
1396           context->GetExtensionID(),
1397           context->GetContextTypeDescription(),
1398           ExtensionsRendererClient::Get()->IsIncognitoProcess(),
1399           is_component_extension,
1400           manifest_version,
1401           send_request_disabled)));
1402
1403   delegate_->RegisterNativeHandlers(this, module_system, context);
1404 }
1405
1406 bool Dispatcher::IsRuntimeAvailableToContext(ScriptContext* context) {
1407   for (const auto& extension :
1408        *RendererExtensionRegistry::Get()->GetMainThreadExtensionSet()) {
1409     ExternallyConnectableInfo* info = static_cast<ExternallyConnectableInfo*>(
1410         extension->GetManifestData(manifest_keys::kExternallyConnectable));
1411     if (info && info->matches.MatchesURL(context->GetURL()))
1412       return true;
1413   }
1414   return false;
1415 }
1416
1417 void Dispatcher::UpdateContentCapabilities(ScriptContext* context) {
1418   APIPermissionSet permissions;
1419   for (const auto& extension :
1420        *RendererExtensionRegistry::Get()->GetMainThreadExtensionSet()) {
1421     const ContentCapabilitiesInfo& info =
1422         ContentCapabilitiesInfo::Get(extension.get());
1423     if (info.url_patterns.MatchesURL(context->GetURL())) {
1424       APIPermissionSet new_permissions;
1425       APIPermissionSet::Union(permissions, info.permissions, &new_permissions);
1426       permissions = new_permissions;
1427     }
1428   }
1429   context->SetContentCapabilities(permissions);
1430 }
1431
1432 void Dispatcher::PopulateSourceMap() {
1433   const std::vector<std::pair<std::string, int> > resources = GetJsResources();
1434   for (std::vector<std::pair<std::string, int> >::const_iterator resource =
1435            resources.begin();
1436        resource != resources.end();
1437        ++resource) {
1438     source_map_.RegisterSource(resource->first, resource->second);
1439   }
1440   delegate_->PopulateSourceMap(&source_map_);
1441 }
1442
1443 bool Dispatcher::IsWithinPlatformApp() {
1444   for (std::set<std::string>::iterator iter = active_extension_ids_.begin();
1445        iter != active_extension_ids_.end();
1446        ++iter) {
1447     const Extension* extension =
1448         RendererExtensionRegistry::Get()->GetByID(*iter);
1449     if (extension && extension->is_platform_app())
1450       return true;
1451   }
1452   return false;
1453 }
1454
1455 v8::Local<v8::Object> Dispatcher::GetOrCreateObject(
1456     const v8::Local<v8::Object>& object,
1457     const std::string& field,
1458     v8::Isolate* isolate) {
1459   v8::Local<v8::String> key = v8::String::NewFromUtf8(isolate, field.c_str());
1460   // If the object has a callback property, it is assumed it is an unavailable
1461   // API, so it is safe to delete. This is checked before GetOrCreateObject is
1462   // called.
1463   if (object->HasRealNamedCallbackProperty(key)) {
1464     object->Delete(key);
1465   } else if (object->HasRealNamedProperty(key)) {
1466     v8::Local<v8::Value> value = object->Get(key);
1467     CHECK(value->IsObject());
1468     return v8::Local<v8::Object>::Cast(value);
1469   }
1470
1471   v8::Local<v8::Object> new_object = v8::Object::New(isolate);
1472   object->Set(key, new_object);
1473   return new_object;
1474 }
1475
1476 v8::Local<v8::Object> Dispatcher::GetOrCreateBindObjectIfAvailable(
1477     const std::string& api_name,
1478     std::string* bind_name,
1479     ScriptContext* context) {
1480   std::vector<std::string> split = base::SplitString(
1481       api_name, ".", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
1482
1483   v8::Local<v8::Object> bind_object;
1484
1485   // Check if this API has an ancestor. If the API's ancestor is available and
1486   // the API is not available, don't install the bindings for this API. If
1487   // the API is available and its ancestor is not, delete the ancestor and
1488   // install the bindings for the API. This is to prevent loading the ancestor
1489   // API schema if it will not be needed.
1490   //
1491   // For example:
1492   //  If app is available and app.window is not, just install app.
1493   //  If app.window is available and app is not, delete app and install
1494   //  app.window on a new object so app does not have to be loaded.
1495   const FeatureProvider* api_feature_provider =
1496       FeatureProvider::GetAPIFeatures();
1497   std::string ancestor_name;
1498   bool only_ancestor_available = false;
1499
1500   for (size_t i = 0; i < split.size() - 1; ++i) {
1501     ancestor_name += (i ? "." : "") + split[i];
1502     if (api_feature_provider->GetFeature(ancestor_name) &&
1503         context->GetAvailability(ancestor_name).is_available() &&
1504         !context->GetAvailability(api_name).is_available()) {
1505       only_ancestor_available = true;
1506       break;
1507     }
1508
1509     if (bind_object.IsEmpty()) {
1510       bind_object = AsObjectOrEmpty(GetOrCreateChrome(context));
1511       if (bind_object.IsEmpty())
1512         return v8::Local<v8::Object>();
1513     }
1514     bind_object = GetOrCreateObject(bind_object, split[i], context->isolate());
1515   }
1516
1517   if (only_ancestor_available)
1518     return v8::Local<v8::Object>();
1519
1520   if (bind_name)
1521     *bind_name = split.back();
1522
1523   return bind_object.IsEmpty() ? AsObjectOrEmpty(GetOrCreateChrome(context))
1524                                : bind_object;
1525 }
1526
1527 void Dispatcher::RequireGuestViewModules(ScriptContext* context) {
1528   Feature::Context context_type = context->context_type();
1529   ModuleSystem* module_system = context->module_system();
1530
1531   // Require AppView.
1532   if (context->GetAvailability("appViewEmbedderInternal").is_available()) {
1533     module_system->Require("appView");
1534   }
1535
1536   // Require ExtensionOptions.
1537   if (context->GetAvailability("extensionOptionsInternal").is_available()) {
1538     module_system->Require("extensionOptions");
1539     module_system->Require("extensionOptionsAttributes");
1540   }
1541
1542   // Require ExtensionView.
1543   if (context->GetAvailability("extensionViewInternal").is_available()) {
1544     module_system->Require("extensionView");
1545     module_system->Require("extensionViewApiMethods");
1546     module_system->Require("extensionViewAttributes");
1547   }
1548
1549   // Require WebView.
1550   if (context->GetAvailability("webViewInternal").is_available()) {
1551     module_system->Require("webView");
1552     module_system->Require("webViewApiMethods");
1553     module_system->Require("webViewAttributes");
1554
1555     if (content::BrowserPluginGuestMode::UseCrossProcessFramesForGuests()) {
1556       module_system->Require("webViewIframe");
1557     }
1558   }
1559
1560   // The "guestViewDeny" module must always be loaded last. It registers
1561   // error-providing custom elements for the GuestView types that are not
1562   // available, and thus all of those types must have been checked and loaded
1563   // (or not loaded) beforehand.
1564   if (context_type == Feature::BLESSED_EXTENSION_CONTEXT) {
1565     module_system->Require("guestViewDeny");
1566   }
1567 }
1568
1569 void Dispatcher::AddChannelSpecificFeatures() {
1570   // chrome-extension: resources should be allowed to register a Service Worker.
1571   if (FeatureProvider::GetBehaviorFeature(BehaviorFeature::kServiceWorker)
1572           ->IsAvailableToEnvironment()
1573           .is_available())
1574     WebSecurityPolicy::registerURLSchemeAsAllowingServiceWorkers(
1575         WebString::fromUTF8(kExtensionScheme));
1576 }
1577
1578 }  // namespace extensions