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

content/public/browser/render_view_host.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_PUBLIC_BROWSER_RENDER_VIEW_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_RENDER_VIEW_HOST_H_
 
 #include "base/values.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/render_widget_host.h"
@@ skipping 221 matching lines @@
   virtual void NotifyContextMenuClosed(
       const CustomContextMenuContext& context) = 0;
 
   // Notification that a move or resize renderer's containing window has
   // started.
   virtual void NotifyMoveOrResizeStarted() = 0;
 
   // Reloads the current focused frame.
   virtual void ReloadFrame() = 0;
 
+  // Retrieves a JSON serialized representation of the frame tree for the
+  // current document in the render view.
+  virtual const std::string& GetFrameTree() const = 0;

[Charlie Reis, 2012/08/21 01:40:39]

Is this ever needed outside the content module?  It seems like an implementation
detail we could probably keep in RenderViewHostImpl.

[nasko, 2012/08/21 17:49:42]

Done.

+
   // Sets the alternate error page URL (link doctor) for the renderer process.
   virtual void SetAltErrorPageURL(const GURL& url) = 0;
 
   // Sets a property with the given name and value on the Web UI binding object.
   // Must call AllowWebUIBindings() on this renderer first.
   virtual void SetWebUIProperty(const std::string& name,
                                 const std::string& value) = 0;
 
   // Set the zoom level for the current main frame
   virtual void SetZoomLevel(double level) = 0;
@@ skipping 11 matching lines @@
   virtual webkit_glue::WebPreferences GetWebkitPreferences() = 0;
 
   // Passes a list of Webkit preferences to the renderer.
   virtual void UpdateWebkitPreferences(
       const webkit_glue::WebPreferences& prefs) = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_RENDER_VIEW_HOST_H_