Support cross-process navigations in a single subframe RenderFrameHost.

content/browser/frame_host/frame_tree.h

 // Copyright 2013 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_FRAME_HOST_FRAME_TREE_H_
 #define CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 106 matching lines @@
   // Returns the existing RenderViewHost for a new subframe RenderFrameHost.
   // There should always be such a RenderViewHost, because the main frame
   // RenderFrameHost for each SiteInstance should be created before subframes.
   RenderViewHostImpl* GetRenderViewHostForSubFrame(SiteInstance* site_instance);
 
   // Keeps track of which RenderFrameHosts are using each RenderViewHost.  When
   // the number drops to zero, we call Shutdown on the RenderViewHost.
   void RegisterRenderFrameHost(RenderFrameHostImpl* render_frame_host);
   void UnregisterRenderFrameHost(RenderFrameHostImpl* render_frame_host);
 
+  // Returns the FrameTreeNode with the given renderer-specific |frame_id|.
+  // TODO(creis): Make this private and replace this with a version that takes
+  // in a routing ID.
+  FrameTreeNode* FindByFrameID(int64 frame_id);
+
  private:
   typedef std::pair<RenderViewHostImpl*, int> RenderViewHostRefCount;
   typedef base::hash_map<int, RenderViewHostRefCount> RenderViewHostMap;
 
-  // Returns the FrameTreeNode with the given renderer-specific |frame_id|.
-  // For internal use only.
-  // TODO(creis): Replace this with a version that takes in a routing ID.
-  FrameTreeNode* FindByFrameID(int64 frame_id);
-
   // These delegates are installed into all the RenderViewHosts and
   // RenderFrameHosts that we create.
   RenderFrameHostDelegate* render_frame_delegate_;
   RenderViewHostDelegate* render_view_delegate_;
   RenderWidgetHostDelegate* render_widget_delegate_;
   RenderFrameHostManager::Delegate* manager_delegate_;
 
   // Map of SiteInstance ID to a (RenderViewHost, refcount) pair.  This allows
   // us to look up the RenderViewHost for a given SiteInstance when creating
   // RenderFrameHosts, and it allows us to call Shutdown on the RenderViewHost
   // and remove it from the map when no more RenderFrameHosts are using it.
   //
   // Must be declared before |root_| so that it is deleted afterward.  Otherwise
   // the map will be cleared before we delete the RenderFrameHosts in the tree.
   RenderViewHostMap render_view_host_map_;
 
   scoped_ptr<FrameTreeNode> root_;
 
   base::Callback<void(RenderViewHostImpl*, int64)> on_frame_removed_;
 
   DISALLOW_COPY_AND_ASSIGN(FrameTree);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_H_