[App Shell] Add dev tools for debugging

apps/shell/browser/shell_browser_main_parts.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_BROWSER_SHELL_BROWSER_MAIN_PARTS_H_
 #define APPS_SHELL_BROWSER_SHELL_BROWSER_MAIN_PARTS_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/public/browser/browser_main_parts.h"
 #include "ui/aura/root_window_observer.h"
 
 namespace aura {
 class TestScreen;
 }
 
 namespace content {
 class ShellBrowserContext;
+class ShellDevToolsDelegate;
 struct MainFunctionParams;
 }
 
 namespace extensions {
 class ShellExtensionsBrowserClient;
 class ShellExtensionSystem;
 }
 
 namespace wm {
 class WMTestHelper;
@@ skipping 50 matching lines @@
   scoped_ptr<ShellBrowserContext> browser_context_;
   scoped_ptr<ShellExtensionsClient> extensions_client_;
   scoped_ptr<extensions::ShellExtensionsBrowserClient>
       extensions_browser_client_;
 
   // Enable a minimal set of views::corewm to be initialized.
   scoped_ptr<wm::WMTestHelper> wm_test_helper_;
 
   scoped_ptr<aura::TestScreen> test_screen_;
 
+  scoped_ptr<content::ShellDevToolsDelegate> devtools_delegate_;
+
   // Owned by the BrowserContextKeyedService system.
   extensions::ShellExtensionSystem* extension_system_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellBrowserMainParts);
 };
 
 }  // namespace apps
 
 #endif  // APPS_SHELL_BROWSER_SHELL_BROWSER_MAIN_PARTS_H_