app-shell: Introduce a ShellRendererMainDelegate.

apps/shell/app/shell_main_delegate.h

 // 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.
 
 #ifndef APPS_SHELL_APP_SHELL_MAIN_DELEGATE_H_
 #define APPS_SHELL_APP_SHELL_MAIN_DELEGATE_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/public/app/content_main_delegate.h"
 
 namespace content {
 class BrowserContext;
 class ContentBrowserClient;
 class ContentClient;
 class ContentRendererClient;
 }
 
 namespace apps {
 class ShellBrowserMainDelegate;
+class ShellRendererMainDelegate;
 
 class ShellMainDelegate : public content::ContentMainDelegate {
  public:
   ShellMainDelegate();
   virtual ~ShellMainDelegate();
 
   // ContentMainDelegate implementation:
   virtual bool BasicStartupComplete(int* exit_code) OVERRIDE;
   virtual void PreSandboxStartup() OVERRIDE;
   virtual content::ContentBrowserClient* CreateContentBrowserClient() OVERRIDE;
   virtual content::ContentRendererClient* CreateContentRendererClient()
       OVERRIDE;
 
  protected:
   // The created object is owned by ShellBrowserMainParts.
   virtual ShellBrowserMainDelegate* CreateShellBrowserMainDelegate();
 
+  // The returned object is owned by ShellContentRendererClient.
+  virtual scoped_ptr<ShellRendererMainDelegate>
+      CreateShellRendererMainDelegate();
+
  private:
   // |process_type| is zygote, renderer, utility, etc. Returns true if the
   // process needs data from resources.pak.
   static bool ProcessNeedsResourceBundle(const std::string& process_type);
 
   // Initializes the resource bundle and resources.pak.
   static void InitializeResourceBundle();
 
   scoped_ptr<content::ContentClient> content_client_;
   scoped_ptr<content::ContentBrowserClient> browser_client_;
   scoped_ptr<content::ContentRendererClient> renderer_client_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellMainDelegate);
 };
 
 }  // namespace apps
 
 #endif  // APPS_SHELL_APP_SHELL_MAIN_DELEGATE_H_