Give the main frame a RenderWidget.

content/renderer/render_frame_impl.cc

 // 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.
 
 #include "content/renderer/render_frame_impl.h"
 
 #include <map>
 #include <string>
 
 #include "base/auto_reset.h"
@@ skipping 550 matching lines @@
 RenderFrameImpl* RenderFrameImpl::FromRoutingID(int routing_id) {
   RoutingIDFrameMap::iterator iter =
       g_routing_id_frame_map.Get().find(routing_id);
   if (iter != g_routing_id_frame_map.Get().end())
     return iter->second;
   return NULL;
 }
 
 // static
 RenderFrameImpl* RenderFrameImpl::CreateMainFrame(RenderViewImpl* render_view,
-                                                  int32 routing_id) {
+    int32 routing_id,
+    int32 widget_routing_id,
+    int32 surface_id,
+    bool hidden,
+    const blink::WebScreenInfo& screen_info,
+    CompositorDependencies* compositor_deps) {
+  // A main frame RenderFrame must have a RenderWidget.
+  DCHECK_NE(MSG_ROUTING_NONE, widget_routing_id);
+
   RenderFrameImpl* render_frame =
       RenderFrameImpl::Create(render_view, routing_id);
   WebLocalFrame* web_frame =
       WebLocalFrame::create(blink::WebTreeScopeType::Document, render_frame);
   render_frame->SetWebFrame(web_frame);
   render_view->webview()->setMainFrame(web_frame);
+  render_frame->render_widget_ =
+      RenderWidget::CreateForFrame(widget_routing_id, surface_id, hidden,
+                                   screen_info, compositor_deps, web_frame);
+  // TODO(kenrb): Observing shouldn't be necessary when we sort out
+  // WasShown and WasHidden, separating page-level visibility from
+  // frame-level visibility.
+  render_frame->render_widget_->RegisterRenderFrame(render_frame);
   return render_frame;
 }
 
 // static
 void RenderFrameImpl::CreateFrame(
     int routing_id,
     int parent_routing_id,
     int previous_sibling_routing_id,
     int proxy_routing_id,
     const FrameReplicationState& replicated_state,
@@ skipping 4536 matching lines @@
     GetServiceRegistry()->ConnectToRemoteService(mojo::GetProxy(&mojo_shell_));
   mojo::ServiceProviderPtr service_provider;
   mojo::URLRequestPtr request(mojo::URLRequest::New());
   request->url = mojo::String::From(url);
   mojo_shell_->ConnectToApplication(request.Pass(), GetProxy(&service_provider),
                                     nullptr, nullptr);
   return service_provider.Pass();
 }
 
 }  // namespace content