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 375 matching lines @@
 #endif
 
 #if defined(OS_ANDROID)
   void DidSelectPopupMenuItems(const std::vector<int>& selected_indices);
   void DidCancelPopupMenu();
 #endif
 
   // User rotated the screen. Calls the "onorientationchange" Javascript hook.
   void SendOrientationChangeEvent(int orientation);
 
+  const std::string& frame_tree() const {
+    return frame_tree_;
+  }
+
+  // Updates the frame tree for this RVH and sends an IPC down to the renderer
+  // process to keep them in sync.

[awong, 2012/08/22 22:25:47]

Refer to comment in view_messages.h.

[nasko, 2012/08/23 21:55:53]

Done.

+  void UpdateFrameTree(int process_id,
+                       int route_id,
+                       const std::string& frame_tree);
+
   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;
   }
 
   const AccessibilityNodeData& accessibility_tree_for_testing() {
     return accessibility_tree_;
@@ skipping 129 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 OnFrameTreeUpdated(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_;
 
+  // A JSON serialized representation of the frame tree for the current document
+  // in the render view.

[awong, 2012/08/22 22:25:47]

Refer to the comment in view_messages so people can figure out what the format
should be.

[nasko, 2012/08/23 21:55:53]

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_