Support sharing of ContentMain and BrowserMain code with embedded use cases.

content/shell/shell_browser_main.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
 #include "content/shell/shell_browser_main.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/message_loop.h"
 #include "base/string_number_conversions.h"
 #include "base/threading/thread.h"
@@ skipping 27 matching lines @@
       devtools_delegate_(NULL) {
   ShellContentBrowserClient* shell_browser_client =
       static_cast<ShellContentBrowserClient*>(
           content::GetContentClient()->browser());
   shell_browser_client->set_shell_browser_main_parts(this);
 }
 
 ShellBrowserMainParts::~ShellBrowserMainParts() {
 }
 
+MessageLoop* ShellBrowserMainParts::GetMainMessageLoop() {
+  return NULL;
+}
+
 void ShellBrowserMainParts::PreMainMessageLoopRun() {
   browser_context_.reset(new ShellBrowserContext(this));
 
   Shell::PlatformInitialize();
   net::NetModule::SetResourceProvider(Shell::PlatformResourceProvider);
 
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
   if (command_line.HasSwitch(switches::kRemoteDebuggingPort)) {
     std::string port_str =
         command_line.GetSwitchValueASCII(switches::kRemoteDebuggingPort);
@@ skipping 24 matching lines @@
   return false;
 }
 
 ui::Clipboard* ShellBrowserMainParts::GetClipboard() {
   if (!clipboard_.get())
     clipboard_.reset(new ui::Clipboard());
   return clipboard_.get();
 }
 
 }  // namespace