Give the main frame a RenderWidget.

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 6d13cdaf0e889ede57abe02c4c0c37cab00a6d75..9d3a8ed0f8d43053b5ae4f4c24a17940b0751904 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -68,6 +68,7 @@ class WebSecurityOrigin;
 struct WebCompositionUnderline;
 struct WebContextMenuData;
 struct WebCursorInfo;
+struct WebScreenInfo;
 }
 
 namespace gfx {
@@ -137,8 +138,13 @@ class CONTENT_EXPORT RenderFrameImpl
       NON_EXPORTED_BASE(public blink::WebPageSerializerClient) {
  public:
   // Creates a new RenderFrame as the main frame of |render_view|.
-  static RenderFrameImpl* CreateMainFrame(RenderViewImpl* render_view,
-                                          int32 routing_id);
+  static RenderFrameImpl* CreateMainFrame(
+      RenderViewImpl* render_view,
+      int32 routing_id,
+      int32 widget_routing_id,
+      bool hidden,
+      const blink::WebScreenInfo& screen_info,
+      CompositorDependencies* compositor_deps);
 
   // Creates a new RenderFrame with |routing_id|.  If |proxy_routing_id| is
   // MSG_ROUTING_NONE, it creates the Blink WebLocalFrame and inserts it into