Give the main frame a RenderWidget.

content/public/test/mock_render_thread.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_PUBLIC_TEST_MOCK_RENDER_THREAD_H_
 #define CONTENT_PUBLIC_TEST_MOCK_RENDER_THREAD_H_
 
 #include "base/memory/shared_memory.h"
 #include "base/observer_list.h"
 #include "base/strings/string16.h"
 #include "cc/test/test_shared_bitmap_manager.h"
 #include "content/public/renderer/render_thread.h"
 #include "ipc/ipc_test_sink.h"
 #include "ipc/message_filter.h"
 #include "third_party/WebKit/public/web/WebPopupType.h"
 
 struct ViewHostMsg_CreateWindow_Params;
+struct ViewHostMsg_CreateWindow_Reply;
 
 namespace IPC {
 class MessageFilter;
 class MessageReplyDeserializer;
 }
 
 namespace blink {
 enum class WebSandboxFlags;
 enum class WebTreeScopeType;
 }
@@ skipping 88 matching lines @@
   // This function operates as a regular IPC listener. Subclasses
   // overriding this should first delegate to this implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg);
 
   // The Widget expects to be returned valid route_id.
   void OnCreateWidget(int opener_id,
                       blink::WebPopupType popup_type,
                       int* route_id,
                       int* surface_id);
 
   // The View expects to be returned a valid route_id different from its own.

[ncarter (slow), 2015/08/24 20:55:35]

|route_id| comment is stale.

[dcheng, 2015/09/03 16:33:09]

Done.

   // We do not keep track of the newly created widget in MockRenderThread,
   // so it must be cleaned up on its own.
-  void OnCreateWindow(
-    const ViewHostMsg_CreateWindow_Params& params,
-    int* route_id,
-    int* main_frame_route_id,
-    int* surface_id,
-    int64* cloned_session_storage_namespace_id);
+  void OnCreateWindow(const ViewHostMsg_CreateWindow_Params& params,
+                      ViewHostMsg_CreateWindow_Reply* reply);
 
   // The Frame expects to be returned a valid route_id different from its own.
   void OnCreateChildFrame(int new_frame_routing_id,
                           blink::WebTreeScopeType scope,
                           const std::string& frame_name,
                           blink::WebSandboxFlags sandbox_flags,
                           int* new_render_frame_id);
 
 #if defined(OS_WIN)
   void OnDuplicateSection(base::SharedMemoryHandle renderer_handle,
@@ skipping 24 matching lines @@
 
   // Observers to notify.
   base::ObserverList<RenderProcessObserver> observers_;
 
   cc::TestSharedBitmapManager shared_bitmap_manager_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_MOCK_RENDER_THREAD_H_