Added enhanced bookmarks extension as an external component extension

chrome/browser/extensions/external_component_loader.h

 // Copyright (c) 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 CHROME_BROWSER_EXTENSIONS_EXTERNAL_COMPONENT_LOADER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTERNAL_COMPONENT_LOADER_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "chrome/browser/extensions/external_loader.h"
 
 namespace extensions {
 
 // A specialization of the ExternalLoader that loads a hard-coded list of
 // external extensions, that should be considered components of chrome (but
 // unlike Component extensions, these extensions are installed from the webstore
 // and don't get access to component only APIs.
 // Instances of this class are expected to be created and destroyed on the UI
 // thread and they are expecting public method calls from the UI thread.
 class ExternalComponentLoader : public ExternalLoader {
  public:
   ExternalComponentLoader();
 
+  static bool IsEnhancedBookmarksExperimentEnabled();
+
  protected:
   virtual void StartLoading() OVERRIDE;
 
  private:
   friend class base::RefCountedThreadSafe<ExternalLoader>;
   virtual ~ExternalComponentLoader();
 
   DISALLOW_COPY_AND_ASSIGN(ExternalComponentLoader);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTERNAL_COMPONENT_LOADER_H_