Support frame tree propagation between renderers in the same browsing instance.

content/browser/renderer_host/render_view_host_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 191 matching lines @@
   virtual RenderViewHostDelegate* GetDelegate() const OVERRIDE;
   virtual int GetEnabledBindings() const OVERRIDE;
   virtual SiteInstance* GetSiteInstance() const OVERRIDE;
   virtual void InsertCSS(const string16& frame_xpath,
                          const std::string& css) OVERRIDE;
   virtual bool IsRenderViewLive() const OVERRIDE;
   virtual void NotifyContextMenuClosed(
       const CustomContextMenuContext& context) OVERRIDE;
   virtual void NotifyMoveOrResizeStarted() OVERRIDE;
   virtual void ReloadFrame() OVERRIDE;
+  virtual const std::string& GetFrameTree() OVERRIDE;
   virtual void SetAltErrorPageURL(const GURL& url) OVERRIDE;
   virtual void SetWebUIProperty(const std::string& name,
                                 const std::string& value) OVERRIDE;
   virtual void SetZoomLevel(double level) OVERRIDE;
   virtual void Zoom(PageZoom zoom) OVERRIDE;
   virtual void SyncRendererPrefs() OVERRIDE;
   virtual void ToggleSpeechInput() OVERRIDE;
   virtual webkit_glue::WebPreferences GetWebkitPreferences() OVERRIDE;
   virtual void UpdateWebkitPreferences(
       const webkit_glue::WebPreferences& prefs) OVERRIDE;
@@ skipping 172 matching lines @@
   void SendOrientationChangeEvent(int orientation);
 
   void set_save_accessibility_tree_for_testing(bool save) {
     save_accessibility_tree_for_testing_ = save;
   }
 
   void set_send_accessibility_updated_notifications(bool send) {
     send_accessibility_updated_notifications_ = send;
   }
 
+  // Updates the frame tree for this RVH and sends an IPC down to the renderer
+  // process to keep them in sync.
+  void UpdateFrameTree(int process_id,

[awong, 2012/08/20 21:56:31]

Note, move this up to under SendOrientatinChangeEvent() so we don't split apart
all the accessibility functions?

[nasko, 2012/08/21 00:34:45]

Done.

+                       int route_id,
+                       const std::string& frame_tree);
+
   const AccessibilityNodeData& accessibility_tree_for_testing() {
     return accessibility_tree_;
   }
 
   bool is_waiting_for_unload_ack_for_testing() {
     return is_waiting_for_unload_ack_;
   }
 
   // Checks that the given renderer can request |url|, if not it sets it to
   // about:blank.
@@ skipping 121 matching lines @@
                            bool has_audio,
                            bool is_playing);
   void OnRequestDesktopNotificationPermission(const GURL& origin,
                                               int callback_id);
   void OnShowDesktopNotification(
       const ShowDesktopNotificationHostMsgParams& params);
   void OnCancelDesktopNotification(int notification_id);
   void OnRunFileChooser(const FileChooserParams& params);
   void OnDomOperationResponse(const std::string& json_string,
                               int automation_id);
+  void OnFrameTree(const std::string& frame_tree);
 
 #if defined(OS_MACOSX) || defined(OS_ANDROID)
   void OnMsgShowPopup(const ViewHostMsg_ShowPopup_Params& params);
 #endif
 
 #if defined(OS_ANDROID)
   void OnStartContentIntent(const GURL& content_url);
 #endif
 
  private:
@@ skipping 75 matching lines @@
   // The session storage namespace to be used by the associated render view.
   scoped_refptr<SessionStorageNamespaceImpl> session_storage_namespace_;
 
   // Whether the accessibility tree should be saved, for unit testing.
   bool save_accessibility_tree_for_testing_;
 
   // Whether accessibility notifications are sent for all WebKit notifications
   // for unit testing.
   bool send_accessibility_updated_notifications_;
 
+  // Serialized frame tree structure for the page displayed by the render view.

[awong, 2012/08/20 21:56:31]

Add something that describes what format this is expected to be in?

[nasko, 2012/08/21 00:34:45]

Done.

+  std::string frame_tree_;
+
   // The most recently received accessibility tree - for unit testing only.
   AccessibilityNodeData accessibility_tree_;
 
   // The termination status of the last render view that terminated.
   base::TerminationStatus render_view_termination_status_;
 
   // Holds PowerSaveBlockers for the media players in use. Key is the
   // player_cookie passed to OnMediaNotification, value is the PowerSaveBlocker.
   typedef std::map<int64, PowerSaveBlocker*> PowerSaveBlockerMap;
   PowerSaveBlockerMap power_save_blockers_;
 
   // A list of observers that filter messages.  Weak references.
   ObserverList<RenderViewHostObserver> observers_;
 
   // When the last ShouldClose message was sent.
   base::TimeTicks send_should_close_start_time_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewHostImpl);
 };
 
 #if defined(COMPILER_MSVC)
 #pragma warning(pop)
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_