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      1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_EXTENSIONS_EXTERNAL_COMPONENT_LOADER_H_
      6 #define CHROME_BROWSER_EXTENSIONS_EXTERNAL_COMPONENT_LOADER_H_
      7 
      8 #include <string>
      9 
     10 #include "base/compiler_specific.h"
     11 #include "chrome/browser/extensions/external_loader.h"
     12 
     13 namespace extensions {
     14 
     15 // A specialization of the ExternalLoader that loads a hard-coded list of
     16 // external extensions, that should be considered components of chrome (but
     17 // unlike Component extensions, these extensions are installed from the webstore
     18 // and don't get access to component only APIs.
     19 // Instances of this class are expected to be created and destroyed on the UI
     20 // thread and they are expecting public method calls from the UI thread.
     21 class ExternalComponentLoader : public ExternalLoader {
     22  public:
     23   ExternalComponentLoader();
     24 
     25  protected:
     26   virtual void StartLoading() OVERRIDE;
     27 
     28  private:
     29   friend class base::RefCountedThreadSafe<ExternalLoader>;
     30   virtual ~ExternalComponentLoader();
     31 
     32   DISALLOW_COPY_AND_ASSIGN(ExternalComponentLoader);
     33 };
     34 
     35 }  // namespace extensions
     36 
     37 #endif  // CHROME_BROWSER_EXTENSIONS_EXTERNAL_COMPONENT_LOADER_H_
     38