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 2822724adfae45a5a56fc078e29376f9ccae6e47..305dfd1a06894e214da4cbba3972d1cc9fcf11ff 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 FrameTreeNode;
 class RenderFrameHostDelegate;
@@ -51,6 +52,9 @@ class CONTENT_EXPORT RenderFrameHostImpl : public RenderFrameHost {
   RenderViewHostImpl* render_view_host() { return render_view_host_; }
   RenderFrameHostDelegate* delegate() { return delegate_; }
 
+  void SetCrossProcessFrameConnector(

[Charlie Reis, 2013/12/17 01:09:31]

It feels odd to me to have no comments on the public contract.  We should at
least tell people to look at the member declaration for an explanation, but
perhaps we can say something about when this should be called.

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

Done.

+      CrossProcessFrameConnector* cross_process_frame_connector);
+
  protected:
   friend class RenderFrameHostFactory;
 
@@ -81,6 +85,19 @@ class CONTENT_EXPORT RenderFrameHostImpl : public RenderFrameHost {
 
   RenderFrameHostDelegate* delegate_;
 
+  // |cross_process_frame_connector_| passes messages from an out-of-process
+  // child frame to the parent frame.
+  //
+  // This is only non-NULL when the RenderFrameHost object is
+  //   (a) swapped out
+  //   (b) has a child frame that 

[nasko, 2013/12/17 00:56:52]

This doesn't end properly, nor does it read coherently if you continue with next
line.

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

Yep...sorry...I hadn't gotten this far yet.

+  // 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
+  // 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.