chrome/browser/extensions/external_component_loader.h

   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 "base/containers/hash_tables.h"
  12 #include "base/memory/weak_ptr.h"
  13 #include "chrome/browser/extensions/external_loader.h"
  14 #include "chrome/browser/profiles/profile.h"
  15
  16 class PrefChangeRegistrar;
  17
  18 namespace extensions {
  19
  20 // A specialization of the ExternalLoader that loads a hard-coded list of
  21 // external extensions, that should be considered components of chrome (but
  22 // unlike Component extensions, these extensions are installed from the webstore
  23 // and don't get access to component only APIs.
  24 // Instances of this class are expected to be created and destroyed on the UI
  25 // thread and they are expecting public method calls from the UI thread.
  26 class ExternalComponentLoader
  27     : public ExternalLoader,
  28       public base::SupportsWeakPtr<ExternalComponentLoader> {
  29  public:
  30   explicit ExternalComponentLoader(Profile* profile);
  31
  32   static bool IsEnhancedBookmarksExperimentEnabled();
  33
  34   // Register speech synthesis prefs for a profile.
  35   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
  36
  37  protected:
  38   virtual void StartLoading() OVERRIDE;
  39
  40  private:
  41   friend class base::RefCountedThreadSafe<ExternalLoader>;
  42   virtual ~ExternalComponentLoader();
  43
  44   // The profile that this loader is associated with. It listens for
  45   // preference changes for that profile.
  46   Profile* profile_;
  47
  48 #if defined(OS_CHROMEOS)
  49   // The pref change registrar, so we can watch for pref changes.
  50   scoped_ptr<PrefChangeRegistrar> pref_change_registrar_;
  51
  52   // A map from language code to the extension id of the high-quality
  53   // extension for that language in the web store, if any - for loading
  54   // speech synthesis component extensions.
  55   base::hash_map<std::string, std::string> lang_to_extension_id_map_;
  56 #endif
  57
  58   DISALLOW_COPY_AND_ASSIGN(ExternalComponentLoader);
  59 };
  60
  61 }  // namespace extensions
  62
  63 #endif  // CHROME_BROWSER_EXTENSIONS_EXTERNAL_COMPONENT_LOADER_H_