extensions/browser/guest_view/guest_view_base.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/browser/guest_view/guest_view_base.h"
   6
   7 #include "base/lazy_instance.h"
   8 #include "base/strings/utf_string_conversions.h"
   9 #include "components/ui/zoom/page_zoom.h"
  10 #include "components/ui/zoom/zoom_controller.h"
  11 #include "content/public/browser/navigation_details.h"
  12 #include "content/public/browser/render_frame_host.h"
  13 #include "content/public/browser/render_process_host.h"
  14 #include "content/public/browser/render_view_host.h"
  15 #include "content/public/browser/web_contents.h"
  16 #include "content/public/common/page_zoom.h"
  17 #include "content/public/common/url_constants.h"
  18 #include "extensions/browser/api/extensions_api_client.h"
  19 #include "extensions/browser/event_router.h"
  20 #include "extensions/browser/extension_registry.h"
  21 #include "extensions/browser/guest_view/app_view/app_view_guest.h"
  22 #include "extensions/browser/guest_view/extension_options/extension_options_guest.h"
  23 #include "extensions/browser/guest_view/extension_view/extension_view_guest.h"
  24 #include "extensions/browser/guest_view/guest_view_manager.h"
  25 #include "extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h"
  26 #include "extensions/browser/guest_view/surface_worker/surface_worker_guest.h"
  27 #include "extensions/browser/guest_view/web_view/web_view_guest.h"
  28 #include "extensions/browser/process_manager.h"
  29 #include "extensions/browser/process_map.h"
  30 #include "extensions/common/features/feature.h"
  31 #include "extensions/common/features/feature_provider.h"
  32 #include "extensions/common/guest_view/guest_view_constants.h"
  33 #include "extensions/common/guest_view/guest_view_messages.h"
  34 #include "third_party/WebKit/public/web/WebInputEvent.h"
  35
  36 using content::WebContents;
  37
  38 namespace content {
  39 struct FrameNavigateParams;
  40 }
  41
  42 namespace extensions {
  43
  44 namespace {
  45
  46 using GuestViewCreationMap =
  47     std::map<std::string, GuestViewBase::GuestCreationCallback>;
  48 static base::LazyInstance<GuestViewCreationMap> guest_view_registry =
  49     LAZY_INSTANCE_INITIALIZER;
  50
  51 using WebContentsGuestViewMap = std::map<WebContents*, GuestViewBase*>;
  52 static base::LazyInstance<WebContentsGuestViewMap> webcontents_guestview_map =
  53     LAZY_INSTANCE_INITIALIZER;
  54
  55 }  // namespace
  56
  57 SetSizeParams::SetSizeParams() {
  58 }
  59 SetSizeParams::~SetSizeParams() {
  60 }
  61
  62 GuestViewBase::Event::Event(const std::string& name,
  63                             scoped_ptr<base::DictionaryValue> args)
  64     : name_(name), args_(args.Pass()) {
  65 }
  66
  67 GuestViewBase::Event::~Event() {
  68 }
  69
  70 scoped_ptr<base::DictionaryValue> GuestViewBase::Event::GetArguments() {
  71   return args_.Pass();
  72 }
  73
  74 // This observer ensures that the GuestViewBase destroys itself when its
  75 // embedder goes away.
  76 class GuestViewBase::OwnerLifetimeObserver : public WebContentsObserver {
  77  public:
  78   OwnerLifetimeObserver(GuestViewBase* guest,
  79                         content::WebContents* embedder_web_contents)
  80       : WebContentsObserver(embedder_web_contents),
  81         destroyed_(false),
  82         guest_(guest) {}
  83
  84   ~OwnerLifetimeObserver() override {}
  85
  86   // WebContentsObserver implementation.
  87   void WebContentsDestroyed() override {
  88     // If the embedder is destroyed then destroy the guest.
  89     Destroy();
  90   }
  91
  92   void DidNavigateMainFrame(
  93       const content::LoadCommittedDetails& details,
  94       const content::FrameNavigateParams& params) override {
  95     // If the embedder navigates to a different page then destroy the guest.
  96     if (details.is_navigation_to_different_page())
  97       Destroy();
  98   }
  99
 100   void RenderProcessGone(base::TerminationStatus status) override {
 101     // If the embedder crashes, then destroy the guest.
 102     Destroy();
 103   }
 104
 105  private:
 106   bool destroyed_;
 107   GuestViewBase* guest_;
 108
 109   void Destroy() {
 110     if (destroyed_)
 111       return;
 112
 113     destroyed_ = true;
 114     guest_->EmbedderWillBeDestroyed();
 115     guest_->Destroy();
 116   }
 117
 118   DISALLOW_COPY_AND_ASSIGN(OwnerLifetimeObserver);
 119 };
 120
 121 // This observer ensures that the GuestViewBase destroys itself when its
 122 // embedder goes away.
 123 class GuestViewBase::OpenerLifetimeObserver : public WebContentsObserver {
 124  public:
 125   OpenerLifetimeObserver(GuestViewBase* guest)
 126       : WebContentsObserver(guest->GetOpener()->web_contents()),
 127         guest_(guest) {}
 128
 129   ~OpenerLifetimeObserver() override {}
 130
 131   // WebContentsObserver implementation.
 132   void WebContentsDestroyed() override {
 133     if (guest_->attached())
 134       return;
 135
 136     // If the opener is destroyed then destroy the guest.
 137     guest_->Destroy();
 138   }
 139
 140  private:
 141   GuestViewBase* guest_;
 142
 143   DISALLOW_COPY_AND_ASSIGN(OpenerLifetimeObserver);
 144 };
 145
 146 GuestViewBase::GuestViewBase(content::WebContents* owner_web_contents)
 147     : owner_web_contents_(owner_web_contents),
 148       browser_context_(owner_web_contents->GetBrowserContext()),
 149       guest_instance_id_(
 150           GuestViewManager::FromBrowserContext(browser_context_)->
 151               GetNextInstanceID()),
 152       view_instance_id_(guestview::kInstanceIDNone),
 153       element_instance_id_(guestview::kInstanceIDNone),
 154       initialized_(false),
 155       is_being_destroyed_(false),
 156       guest_sizer_(nullptr),
 157       auto_size_enabled_(false),
 158       is_full_page_plugin_(false),
 159       weak_ptr_factory_(this) {
 160 }
 161
 162 void GuestViewBase::Init(const base::DictionaryValue& create_params,
 163                          const WebContentsCreatedCallback& callback) {
 164   if (initialized_)
 165     return;
 166   initialized_ = true;
 167
 168   const Feature* feature = FeatureProvider::GetAPIFeature(GetAPINamespace());
 169   CHECK(feature);
 170
 171   ProcessMap* process_map = ProcessMap::Get(browser_context());
 172   CHECK(process_map);
 173
 174   const Extension* owner_extension =
 175       ProcessManager::Get(owner_web_contents()->GetBrowserContext())->
 176           GetExtensionForRenderViewHost(
 177               owner_web_contents()->GetRenderViewHost());
 178   owner_extension_id_ = owner_extension ? owner_extension->id() : std::string();
 179
 180   // Ok for |owner_extension| to be nullptr, the embedder might be WebUI.
 181   Feature::Availability availability = feature->IsAvailableToContext(
 182       owner_extension,
 183       process_map->GetMostLikelyContextType(
 184           owner_extension,
 185           owner_web_contents()->GetRenderProcessHost()->GetID()),
 186       GetOwnerSiteURL());
 187   if (!availability.is_available()) {
 188     // The derived class did not create a WebContents so this class serves no
 189     // purpose. Let's self-destruct.
 190     delete this;
 191     callback.Run(nullptr);
 192     return;
 193   }
 194
 195   scoped_ptr<base::DictionaryValue> params(create_params.DeepCopy());
 196   CreateWebContents(create_params,
 197                     base::Bind(&GuestViewBase::CompleteInit,
 198                                weak_ptr_factory_.GetWeakPtr(),
 199                                base::Passed(&params),
 200                                callback));
 201 }
 202
 203 void GuestViewBase::InitWithWebContents(
 204     const base::DictionaryValue& create_params,
 205     content::WebContents* guest_web_contents) {
 206   DCHECK(guest_web_contents);
 207
 208   // At this point, we have just created the guest WebContents, we need to add
 209   // an observer to the owner WebContents. This observer will be responsible
 210   // for destroying the guest WebContents if the owner goes away.
 211   owner_lifetime_observer_.reset(
 212       new OwnerLifetimeObserver(this, owner_web_contents_));
 213
 214   WebContentsObserver::Observe(guest_web_contents);
 215   guest_web_contents->SetDelegate(this);
 216   webcontents_guestview_map.Get().insert(
 217       std::make_pair(guest_web_contents, this));
 218   GuestViewManager::FromBrowserContext(browser_context_)->
 219       AddGuest(guest_instance_id_, guest_web_contents);
 220
 221   // Create a ZoomController to allow the guest's contents to be zoomed.
 222   ui_zoom::ZoomController::CreateForWebContents(guest_web_contents);
 223
 224   // Populate the view instance ID if we have it on creation.
 225   create_params.GetInteger(guestview::kParameterInstanceId,
 226                            &view_instance_id_);
 227
 228   if (CanRunInDetachedState())
 229     SetUpSizing(create_params);
 230
 231   // Give the derived class an opportunity to perform additional initialization.
 232   DidInitialize(create_params);
 233 }
 234
 235 void GuestViewBase::DispatchOnResizeEvent(const gfx::Size& old_size,
 236                                           const gfx::Size& new_size) {
 237   if (new_size == old_size)
 238     return;
 239
 240   // Dispatch the onResize event.
 241   scoped_ptr<base::DictionaryValue> args(new base::DictionaryValue());
 242   args->SetInteger(guestview::kOldWidth, old_size.width());
 243   args->SetInteger(guestview::kOldHeight, old_size.height());
 244   args->SetInteger(guestview::kNewWidth, new_size.width());
 245   args->SetInteger(guestview::kNewHeight, new_size.height());
 246   DispatchEventToGuestProxy(new Event(guestview::kEventResize, args.Pass()));
 247 }
 248
 249 void GuestViewBase::SetSize(const SetSizeParams& params) {
 250   bool enable_auto_size =
 251       params.enable_auto_size ? *params.enable_auto_size : auto_size_enabled_;
 252   gfx::Size min_size = params.min_size ? *params.min_size : min_auto_size_;
 253   gfx::Size max_size = params.max_size ? *params.max_size : max_auto_size_;
 254
 255   if (params.normal_size)
 256     normal_size_ = *params.normal_size;
 257
 258   min_auto_size_ = min_size;
 259   min_auto_size_.SetToMin(max_size);
 260   max_auto_size_ = max_size;
 261   max_auto_size_.SetToMax(min_size);
 262
 263   enable_auto_size &= !min_auto_size_.IsEmpty() && !max_auto_size_.IsEmpty() &&
 264                       IsAutoSizeSupported();
 265
 266   content::RenderViewHost* rvh = web_contents()->GetRenderViewHost();
 267   if (enable_auto_size) {
 268     // Autosize is being enabled.
 269     rvh->EnableAutoResize(min_auto_size_, max_auto_size_);
 270     normal_size_.SetSize(0, 0);
 271   } else {
 272     // Autosize is being disabled.
 273     // Use default width/height if missing from partially defined normal size.
 274     if (normal_size_.width() && !normal_size_.height())
 275       normal_size_.set_height(guestview::kDefaultHeight);
 276     if (!normal_size_.width() && normal_size_.height())
 277       normal_size_.set_width(guestview::kDefaultWidth);
 278
 279     gfx::Size new_size;
 280     if (!normal_size_.IsEmpty()) {
 281       new_size = normal_size_;
 282     } else if (!guest_size_.IsEmpty()) {
 283       new_size = guest_size_;
 284     } else {
 285       new_size = gfx::Size(guestview::kDefaultWidth, guestview::kDefaultHeight);
 286     }
 287
 288     if (auto_size_enabled_) {
 289       // Autosize was previously enabled.
 290       rvh->DisableAutoResize(new_size);
 291       GuestSizeChangedDueToAutoSize(guest_size_, new_size);
 292     } else {
 293       // Autosize was already disabled.
 294       guest_sizer_->SizeContents(new_size);
 295     }
 296
 297     DispatchOnResizeEvent(guest_size_, new_size);
 298     guest_size_ = new_size;
 299   }
 300
 301   auto_size_enabled_ = enable_auto_size;
 302 }
 303
 304 // static
 305 void GuestViewBase::RegisterGuestViewType(
 306     const std::string& view_type,
 307     const GuestCreationCallback& callback) {
 308   auto it = guest_view_registry.Get().find(view_type);
 309   DCHECK(it == guest_view_registry.Get().end());
 310   guest_view_registry.Get()[view_type] = callback;
 311 }
 312
 313 // static
 314 GuestViewBase* GuestViewBase::Create(
 315     content::WebContents* owner_web_contents,
 316     const std::string& view_type) {
 317   if (guest_view_registry.Get().empty())
 318     RegisterGuestViewTypes();
 319
 320   auto it = guest_view_registry.Get().find(view_type);
 321   if (it == guest_view_registry.Get().end()) {
 322     NOTREACHED();
 323     return nullptr;
 324   }
 325   return it->second.Run(owner_web_contents);
 326 }
 327
 328 // static
 329 GuestViewBase* GuestViewBase::FromWebContents(WebContents* web_contents) {
 330   WebContentsGuestViewMap* guest_map = webcontents_guestview_map.Pointer();
 331   auto it = guest_map->find(web_contents);
 332   return it == guest_map->end() ? nullptr : it->second;
 333 }
 334
 335 // static
 336 GuestViewBase* GuestViewBase::From(int owner_process_id,
 337                                    int guest_instance_id) {
 338   auto host = content::RenderProcessHost::FromID(owner_process_id);
 339   if (!host)
 340     return nullptr;
 341
 342   content::WebContents* guest_web_contents =
 343       GuestViewManager::FromBrowserContext(host->GetBrowserContext())->
 344           GetGuestByInstanceIDSafely(guest_instance_id, owner_process_id);
 345   if (!guest_web_contents)
 346     return nullptr;
 347
 348   return GuestViewBase::FromWebContents(guest_web_contents);
 349 }
 350
 351 // static
 352 bool GuestViewBase::IsGuest(WebContents* web_contents) {
 353   return !!GuestViewBase::FromWebContents(web_contents);
 354 }
 355
 356 bool GuestViewBase::IsAutoSizeSupported() const {
 357   return false;
 358 }
 359
 360 bool GuestViewBase::IsPreferredSizeModeEnabled() const {
 361   return false;
 362 }
 363
 364 bool GuestViewBase::IsDragAndDropEnabled() const {
 365   return false;
 366 }
 367
 368 bool GuestViewBase::ZoomPropagatesFromEmbedderToGuest() const {
 369   return true;
 370 }
 371
 372 content::WebContents* GuestViewBase::CreateNewGuestWindow(
 373     const content::WebContents::CreateParams& create_params) {
 374   auto guest_manager = GuestViewManager::FromBrowserContext(browser_context());
 375   return guest_manager->CreateGuestWithWebContentsParams(
 376       GetViewType(),
 377       owner_web_contents(),
 378       create_params);
 379 }
 380
 381 void GuestViewBase::DidAttach(int guest_proxy_routing_id) {
 382   opener_lifetime_observer_.reset();
 383
 384   SetUpSizing(*attach_params());
 385
 386   // Give the derived class an opportunity to perform some actions.
 387   DidAttachToEmbedder();
 388
 389   // Inform the associated GuestViewContainer that the contentWindow is ready.
 390   embedder_web_contents()->Send(new GuestViewMsg_GuestAttached(
 391       element_instance_id_,
 392       guest_proxy_routing_id));
 393
 394   SendQueuedEvents();
 395 }
 396
 397 void GuestViewBase::DidDetach() {
 398   GuestViewManager::FromBrowserContext(browser_context_)->DetachGuest(
 399       this, element_instance_id_);
 400   StopTrackingEmbedderZoomLevel();
 401   owner_web_contents()->Send(new GuestViewMsg_GuestDetached(
 402       element_instance_id_));
 403   element_instance_id_ = guestview::kInstanceIDNone;
 404 }
 405
 406 void GuestViewBase::ElementSizeChanged(const gfx::Size& size) {
 407   if (size.IsEmpty())
 408     return;
 409
 410   // Only resize if needed.
 411   guest_sizer_->SizeContents(size);
 412   DispatchOnResizeEvent(guest_size_, size);
 413   guest_size_ = size;
 414 }
 415
 416 WebContents* GuestViewBase::GetOwnerWebContents() const {
 417   return owner_web_contents_;
 418 }
 419
 420 void GuestViewBase::GuestSizeChanged(const gfx::Size& new_size) {
 421   if (!auto_size_enabled_)
 422     return;
 423   GuestSizeChangedDueToAutoSize(guest_size_, new_size);
 424   DispatchOnResizeEvent(guest_size_, new_size);
 425   guest_size_ = new_size;
 426 }
 427
 428 const GURL& GuestViewBase::GetOwnerSiteURL() const {
 429   return owner_web_contents()->GetLastCommittedURL();
 430 }
 431
 432 void GuestViewBase::Destroy() {
 433   if (is_being_destroyed_)
 434     return;
 435
 436   is_being_destroyed_ = true;
 437
 438   guest_sizer_ = nullptr;
 439
 440   // It is important to clear owner_web_contents_ after the call to
 441   // StopTrackingEmbedderZoomLevel(), but before the rest of
 442   // the statements in this function.
 443   StopTrackingEmbedderZoomLevel();
 444   owner_web_contents_ = nullptr;
 445
 446   DCHECK(web_contents());
 447
 448   // Give the derived class an opportunity to perform some cleanup.
 449   WillDestroy();
 450
 451   // Invalidate weak pointers now so that bound callbacks cannot be called late
 452   // into destruction. We must call this after WillDestroy because derived types
 453   // may wish to access their openers.
 454   weak_ptr_factory_.InvalidateWeakPtrs();
 455
 456   // Give the content module an opportunity to perform some cleanup.
 457   if (!destruction_callback_.is_null())
 458     destruction_callback_.Run();
 459
 460   webcontents_guestview_map.Get().erase(web_contents());
 461   GuestViewManager::FromBrowserContext(browser_context_)->
 462       RemoveGuest(guest_instance_id_);
 463   pending_events_.clear();
 464
 465   delete web_contents();
 466 }
 467
 468 void GuestViewBase::SetAttachParams(const base::DictionaryValue& params) {
 469   attach_params_.reset(params.DeepCopy());
 470   attach_params_->GetInteger(guestview::kParameterInstanceId,
 471                              &view_instance_id_);
 472 }
 473
 474 void GuestViewBase::SetOpener(GuestViewBase* guest) {
 475   if (guest && guest->IsViewType(GetViewType())) {
 476     opener_ = guest->weak_ptr_factory_.GetWeakPtr();
 477     if (!attached())
 478       opener_lifetime_observer_.reset(new OpenerLifetimeObserver(this));
 479     return;
 480   }
 481   opener_ = base::WeakPtr<GuestViewBase>();
 482   opener_lifetime_observer_.reset();
 483 }
 484
 485 void GuestViewBase::RegisterDestructionCallback(
 486     const DestructionCallback& callback) {
 487   destruction_callback_ = callback;
 488 }
 489
 490 void GuestViewBase::SetGuestSizer(content::GuestSizer* guest_sizer) {
 491   guest_sizer_ = guest_sizer;
 492 }
 493
 494 void GuestViewBase::WillAttach(content::WebContents* embedder_web_contents,
 495                                int element_instance_id,
 496                                bool is_full_page_plugin) {
 497   if (owner_web_contents_ != embedder_web_contents) {
 498     DCHECK_EQ(owner_lifetime_observer_->web_contents(), owner_web_contents_);
 499     // Stop tracking the old embedder's zoom level.
 500     StopTrackingEmbedderZoomLevel();
 501     owner_web_contents_ = embedder_web_contents;
 502     owner_lifetime_observer_.reset(
 503         new OwnerLifetimeObserver(this, embedder_web_contents));
 504   }
 505
 506   // Start tracking the new embedder's zoom level.
 507   StartTrackingEmbedderZoomLevel();
 508   element_instance_id_ = element_instance_id;
 509   is_full_page_plugin_ = is_full_page_plugin;
 510
 511   WillAttachToEmbedder();
 512 }
 513
 514 void GuestViewBase::DidStopLoading(content::RenderViewHost* render_view_host) {
 515   if (IsPreferredSizeModeEnabled()) {
 516     render_view_host->EnablePreferredSizeMode();
 517   }
 518   if (!IsDragAndDropEnabled()) {
 519     const char script[] = "window.addEventListener('dragstart', function() { "
 520                           "  window.event.preventDefault(); "
 521                           "});";
 522     render_view_host->GetMainFrame()->ExecuteJavaScript(
 523         base::ASCIIToUTF16(script));
 524   }
 525   DidStopLoading();
 526 }
 527
 528 void GuestViewBase::RenderViewReady() {
 529   GuestReady();
 530 }
 531
 532 void GuestViewBase::WebContentsDestroyed() {
 533   // Let the derived class know that its WebContents is in the process of
 534   // being destroyed. web_contents() is still valid at this point.
 535   // TODO(fsamuel): This allows for reentrant code into WebContents during
 536   // destruction. This could potentially lead to bugs. Perhaps we should get rid
 537   // of this?
 538   GuestDestroyed();
 539
 540   // Self-destruct.
 541   delete this;
 542 }
 543
 544 void GuestViewBase::ActivateContents(WebContents* web_contents) {
 545   if (!attached() || !embedder_web_contents()->GetDelegate())
 546     return;
 547
 548   embedder_web_contents()->GetDelegate()->ActivateContents(
 549       embedder_web_contents());
 550 }
 551
 552 void GuestViewBase::DeactivateContents(WebContents* web_contents) {
 553   if (!attached() || !embedder_web_contents()->GetDelegate())
 554     return;
 555
 556   embedder_web_contents()->GetDelegate()->DeactivateContents(
 557       embedder_web_contents());
 558 }
 559
 560 void GuestViewBase::ContentsMouseEvent(content::WebContents* source,
 561                                        const gfx::Point& location,
 562                                        bool motion) {
 563   if (!attached() || !embedder_web_contents()->GetDelegate())
 564     return;
 565
 566   embedder_web_contents()->GetDelegate()->ContentsMouseEvent(
 567       embedder_web_contents(), location, motion);
 568 }
 569
 570 void GuestViewBase::ContentsZoomChange(bool zoom_in) {
 571   ui_zoom::PageZoom::Zoom(
 572       embedder_web_contents(),
 573       zoom_in ? content::PAGE_ZOOM_IN : content::PAGE_ZOOM_OUT);
 574 }
 575
 576 void GuestViewBase::HandleKeyboardEvent(
 577     WebContents* source,
 578     const content::NativeWebKeyboardEvent& event) {
 579   if (!attached())
 580     return;
 581
 582   // Send the keyboard events back to the embedder to reprocess them.
 583   embedder_web_contents()->GetDelegate()->
 584       HandleKeyboardEvent(embedder_web_contents(), event);
 585 }
 586
 587 void GuestViewBase::LoadingStateChanged(content::WebContents* source,
 588                                         bool to_different_document) {
 589   if (!attached() || !embedder_web_contents()->GetDelegate())
 590     return;
 591
 592   embedder_web_contents()->GetDelegate()->LoadingStateChanged(
 593       embedder_web_contents(), to_different_document);
 594 }
 595
 596 content::ColorChooser* GuestViewBase::OpenColorChooser(
 597     WebContents* web_contents,
 598     SkColor color,
 599     const std::vector<content::ColorSuggestion>& suggestions) {
 600   if (!attached() || !embedder_web_contents()->GetDelegate())
 601     return nullptr;
 602
 603   return embedder_web_contents()->GetDelegate()->OpenColorChooser(
 604       web_contents, color, suggestions);
 605 }
 606
 607 void GuestViewBase::RunFileChooser(WebContents* web_contents,
 608                                    const content::FileChooserParams& params) {
 609   if (!attached() || !embedder_web_contents()->GetDelegate())
 610     return;
 611
 612   embedder_web_contents()->GetDelegate()->RunFileChooser(web_contents, params);
 613 }
 614
 615 bool GuestViewBase::ShouldFocusPageAfterCrash() {
 616   // Focus is managed elsewhere.
 617   return false;
 618 }
 619
 620 bool GuestViewBase::PreHandleGestureEvent(content::WebContents* source,
 621                                          const blink::WebGestureEvent& event) {
 622   return event.type == blink::WebGestureEvent::GesturePinchBegin ||
 623       event.type == blink::WebGestureEvent::GesturePinchUpdate ||
 624       event.type == blink::WebGestureEvent::GesturePinchEnd;
 625 }
 626
 627 void GuestViewBase::UpdatePreferredSize(
 628     content::WebContents* target_web_contents,
 629     const gfx::Size& pref_size) {
 630   // In theory it's not necessary to check IsPreferredSizeModeEnabled() because
 631   // there will only be events if it was enabled in the first place. However,
 632   // something else may have turned on preferred size mode, so double check.
 633   DCHECK_EQ(web_contents(), target_web_contents);
 634   if (IsPreferredSizeModeEnabled()) {
 635     OnPreferredSizeChanged(pref_size);
 636   }
 637 }
 638
 639 void GuestViewBase::UpdateTargetURL(content::WebContents* source,
 640                                     const GURL& url) {
 641   if (!attached() || !embedder_web_contents()->GetDelegate())
 642     return;
 643
 644   embedder_web_contents()->GetDelegate()->UpdateTargetURL(
 645       embedder_web_contents(), url);
 646 }
 647
 648 GuestViewBase::~GuestViewBase() {
 649 }
 650
 651 void GuestViewBase::OnZoomChanged(
 652     const ui_zoom::ZoomController::ZoomChangedEventData& data) {
 653   auto guest_zoom_controller =
 654       ui_zoom::ZoomController::FromWebContents(web_contents());
 655   if (content::ZoomValuesEqual(data.new_zoom_level,
 656                                guest_zoom_controller->GetZoomLevel())) {
 657     return;
 658   }
 659   // When the embedder's zoom level doesn't match the guest's, then update the
 660   // guest's zoom level to match.
 661   guest_zoom_controller->SetZoomLevel(data.new_zoom_level);
 662 }
 663
 664 void GuestViewBase::DispatchEventToGuestProxy(Event* event) {
 665   DispatchEvent(event, guest_instance_id_);
 666 }
 667
 668 void GuestViewBase::DispatchEventToView(Event* event) {
 669   if (!attached() &&
 670       (!CanRunInDetachedState() || !can_owner_receive_events())) {
 671     pending_events_.push_back(linked_ptr<Event>(event));
 672     return;
 673   }
 674
 675   DispatchEvent(event, view_instance_id_);
 676 }
 677
 678 void GuestViewBase::DispatchEvent(Event* event, int instance_id) {
 679   scoped_ptr<Event> event_ptr(event);
 680
 681   EventFilteringInfo info;
 682   info.SetInstanceID(instance_id);
 683   scoped_ptr<base::ListValue> args(new base::ListValue());
 684   args->Append(event->GetArguments().release());
 685
 686   EventRouter::DispatchEvent(
 687       owner_web_contents_,
 688       browser_context_,
 689       owner_extension_id_,
 690       event->name(),
 691       args.Pass(),
 692       EventRouter::USER_GESTURE_UNKNOWN,
 693       info);
 694 }
 695
 696 void GuestViewBase::SendQueuedEvents() {
 697   if (!attached())
 698     return;
 699   while (!pending_events_.empty()) {
 700     linked_ptr<Event> event_ptr = pending_events_.front();
 701     pending_events_.pop_front();
 702     DispatchEvent(event_ptr.release(), view_instance_id_);
 703   }
 704 }
 705
 706 void GuestViewBase::CompleteInit(
 707     scoped_ptr<base::DictionaryValue> create_params,
 708     const WebContentsCreatedCallback& callback,
 709     content::WebContents* guest_web_contents) {
 710   if (!guest_web_contents) {
 711     // The derived class did not create a WebContents so this class serves no
 712     // purpose. Let's self-destruct.
 713     delete this;
 714     callback.Run(nullptr);
 715     return;
 716   }
 717   InitWithWebContents(*create_params, guest_web_contents);
 718   callback.Run(guest_web_contents);
 719 }
 720
 721 void GuestViewBase::SetUpSizing(const base::DictionaryValue& params) {
 722   // Read the autosize parameters passed in from the embedder.
 723   bool auto_size_enabled = false;
 724   params.GetBoolean(guestview::kAttributeAutoSize, &auto_size_enabled);
 725
 726   int max_height = 0;
 727   int max_width = 0;
 728   params.GetInteger(guestview::kAttributeMaxHeight, &max_height);
 729   params.GetInteger(guestview::kAttributeMaxWidth, &max_width);
 730
 731   int min_height = 0;
 732   int min_width = 0;
 733   params.GetInteger(guestview::kAttributeMinHeight, &min_height);
 734   params.GetInteger(guestview::kAttributeMinWidth, &min_width);
 735
 736   // Set the normal size to the element size so that the guestview will fit the
 737   // element initially if autosize is disabled.
 738   int normal_height = 0;
 739   int normal_width = 0;
 740   params.GetInteger(guestview::kElementHeight, &normal_height);
 741   params.GetInteger(guestview::kElementWidth, &normal_width);
 742
 743   SetSizeParams set_size_params;
 744   set_size_params.enable_auto_size.reset(new bool(auto_size_enabled));
 745   set_size_params.min_size.reset(new gfx::Size(min_width, min_height));
 746   set_size_params.max_size.reset(new gfx::Size(max_width, max_height));
 747   set_size_params.normal_size.reset(new gfx::Size(normal_width, normal_height));
 748
 749   // Call SetSize to apply all the appropriate validation and clipping of
 750   // values.
 751   SetSize(set_size_params);
 752 }
 753
 754 void GuestViewBase::StartTrackingEmbedderZoomLevel() {
 755   if (!ZoomPropagatesFromEmbedderToGuest())
 756     return;
 757
 758   auto embedder_zoom_controller =
 759       ui_zoom::ZoomController::FromWebContents(owner_web_contents());
 760   // Chrome Apps do not have a ZoomController.
 761   if (!embedder_zoom_controller)
 762     return;
 763   // Listen to the embedder's zoom changes.
 764   embedder_zoom_controller->AddObserver(this);
 765   // Set the guest's initial zoom level to be equal to the embedder's.
 766   ui_zoom::ZoomController::FromWebContents(web_contents())
 767       ->SetZoomLevel(embedder_zoom_controller->GetZoomLevel());
 768 }
 769
 770 void GuestViewBase::StopTrackingEmbedderZoomLevel() {
 771   if (!attached() || !ZoomPropagatesFromEmbedderToGuest())
 772     return;
 773
 774   auto embedder_zoom_controller =
 775       ui_zoom::ZoomController::FromWebContents(owner_web_contents());
 776   // Chrome Apps do not have a ZoomController.
 777   if (!embedder_zoom_controller)
 778     return;
 779   embedder_zoom_controller->RemoveObserver(this);
 780 }
 781
 782 // static
 783 void GuestViewBase::RegisterGuestViewTypes() {
 784   AppViewGuest::Register();
 785   ExtensionOptionsGuest::Register();
 786   ExtensionViewGuest::Register();
 787   MimeHandlerViewGuest::Register();
 788   SurfaceWorkerGuest::Register();
 789   WebViewGuest::Register();
 790 }
 791
 792 }  // namespace extensions