Make RenderFrame(Host) own a RenderWidget(Host).

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index 31ab4d237001cc0a82edaa3796487a60585eb036..e17bc384f216214d680806f2510cf95a1359cda3 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -36,6 +36,7 @@
 class GURL;
 class TransportDIB;
 struct FrameMsg_Navigate_Params;
+struct FrameMsg_NewFrame_WidgetParams;
 
 namespace blink {
 class WebGeolocationClient;
@@ -105,7 +106,9 @@ class CONTENT_EXPORT RenderFrameImpl
   // Note: This is called only when RenderFrame is being created in response to
   // IPC message from the browser process. All other frame creation is driven
   // through Blink and Create.
-  static void CreateFrame(int routing_id, int parent_routing_id);
+  static void CreateFrame(int routing_id,
+                          int parent_routing_id,
+                          const FrameMsg_NewFrame_WidgetParams& params);
 
   // Returns the RenderFrameImpl for the given routing ID.
   static RenderFrameImpl* FromRoutingID(int routing_id);
@@ -648,6 +651,13 @@ class CONTENT_EXPORT RenderFrameImpl
   RenderFrameProxy* render_frame_proxy_;
   bool is_detaching_;
 
+  // Used when the RenderFrame is a local frame root; for now RenderWidgets are
+  // added only when a child frame is in a different process from its parent
+  // frame, but eventually this will also apply to top-level frames.
+  // FIXME(kenrb): Correct the above statement when top-level frames have their
+  // own RenderWidgets.
+  scoped_refptr<RenderWidget> render_widget_;
+
 #if defined(ENABLE_PLUGINS)
   // Current text input composition text. Empty if no composition is in
   // progress.