Support exposing Mojo services between render frames, render threads, and their respective hosts.

chrome/browser/ui/webui/mojo_web_ui_controller.h

 // Copyright 2014 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 CHROME_BROWSER_UI_WEBUI_MOJO_WEB_UI_CONTROLLER_H_
 #define CHROME_BROWSER_UI_WEBUI_MOJO_WEB_UI_CONTROLLER_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "content/public/browser/web_ui_controller.h"
 #include "mojo/public/cpp/system/core.h"
 
 class MojoWebUIHandler;
 
 namespace content {
 class WebUIDataSource;
 }
 
 // MojoWebUIController is intended for web ui pages that use mojo. It is
@@ skipping 14 matching lines @@
 
  protected:
   // Invoke to register mapping between binding file and resource id (IDR_...).
   void AddMojoResourcePath(const std::string& path, int resource_id);
 
   // Invoked to create the specific bindings implementation.
   virtual scoped_ptr<MojoWebUIHandler> CreateUIHandler(
       mojo::ScopedMessagePipeHandle handle_to_page) = 0;
 
  private:
+  // Invoked in response to a connection from the renderer.
+  void CreateAndStoreUIHandler(mojo::ScopedMessagePipeHandle handle);
+
   // Bindings files are registered here.
   content::WebUIDataSource* mojo_data_source_;
 
   scoped_ptr<MojoWebUIHandler> ui_handler_;
 
+  base::WeakPtrFactory<MojoWebUIController> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(MojoWebUIController);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_MOJO_WEB_UI_CONTROLLER_H_