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