app-shell: Introduce a ShellRendererMainDelegate.

apps/shell/app/shell_main_delegate.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 "apps/shell/app/shell_main_delegate.h"
 
 #include "apps/shell/browser/default_shell_browser_main_delegate.h"
 #include "apps/shell/browser/shell_content_browser_client.h"
 #include "apps/shell/common/shell_content_client.h"
 #include "apps/shell/renderer/shell_content_renderer_client.h"
@@ skipping 55 matching lines @@
 }
 
 content::ContentBrowserClient* ShellMainDelegate::CreateContentBrowserClient() {
   browser_client_.reset(
       new apps::ShellContentBrowserClient(CreateShellBrowserMainDelegate()));
   return browser_client_.get();
 }
 
 content::ContentRendererClient*
 ShellMainDelegate::CreateContentRendererClient() {
-  renderer_client_.reset(new ShellContentRendererClient);
+  renderer_client_.reset(
+      new ShellContentRendererClient(CreateShellRendererMainDelegate()));
   return renderer_client_.get();
 }
 
 ShellBrowserMainDelegate* ShellMainDelegate::CreateShellBrowserMainDelegate() {
   return new DefaultShellBrowserMainDelegate();
 }
 
+ShellRendererMainDelegate*
+ShellMainDelegate::CreateShellRendererMainDelegate() {
+  return NULL;
+}
+
 // static
 bool ShellMainDelegate::ProcessNeedsResourceBundle(
     const std::string& process_type) {
   // The browser process has no process type flag, but needs resources.
   // On Linux the zygote process opens the resources for the renderers.
   return process_type.empty() ||
          process_type == switches::kZygoteProcess ||
          process_type == switches::kRendererProcess ||
          process_type == switches::kUtilityProcess;
 }
 
 void ShellMainDelegate::InitializeResourceBundle() {
   base::FilePath pak_dir;
   PathService::Get(base::DIR_MODULE, &pak_dir);
   ui::ResourceBundle::InitSharedInstanceWithPakPath(
       pak_dir.AppendASCII("app_shell.pak"));
 }
 
 }  // namespace apps