Adding RenderWidgetHostViewChildFrame for OOPIF view.

content/browser/frame_host/render_frame_host_impl.h

Index: content/browser/frame_host/render_frame_host_impl.h
diff --git a/content/browser/frame_host/render_frame_host_impl.h b/content/browser/frame_host/render_frame_host_impl.h
index 127d96adfb5e711eddb12371708a01316fbd4e1b..c005d6f7d4bd84b275d73c917cd745aaa71d7132 100644
--- a/content/browser/frame_host/render_frame_host_impl.h
+++ b/content/browser/frame_host/render_frame_host_impl.h
@@ -19,6 +19,7 @@ class FilePath;
 
 namespace content {
 
+class CrossProcessFrameConnector;
 class FrameTree;
 class RenderFrameHostDelegate;
 class RenderProcessHost;
@@ -50,6 +51,9 @@ class CONTENT_EXPORT RenderFrameHostImpl : public RenderFrameHost {
   RenderViewHostImpl* render_view_host() { return render_view_host_; }
   RenderFrameHostDelegate* delegate() { return delegate_; }
 
+  void SetCrossProcessFrameConnector(
+      CrossProcessFrameConnector* cross_process_frame_connector);
+
  protected:
   friend class RenderFrameHostFactory;
 
@@ -77,6 +81,13 @@ class CONTENT_EXPORT RenderFrameHostImpl : public RenderFrameHost {
 
   RenderFrameHostDelegate* delegate_;
 
+  // Object that handles messages destined to a child frame in another
+  // process from its parent. Non-NULL only when this RenderFrameHost is
+  // swapped out and corresponds to a direct child frame of a frame in its

[Charlie Reis, 2013/12/16 19:31:08]

What does "corresponds to a direct child frame of a frame in its renderer
process" mean?  Maybe an example would help.

[awong, 2013/12/17 02:45:27]

Fixed.

+  // renderer process.
+  // This will move to RenderFrameProxyHost when that class is created.
+  CrossProcessFrameConnector* cross_process_frame_connector_;
+
   // Reference to the whole frame tree that this RenderFrameHost belongs too.
   // Allows this RenderFrameHost to add and remove nodes in response to
   // messages from the renderer requesting DOM manipulation.