Load the Chrome OS TTS engine manifest from the file system isntead of resources.

chrome/browser/extensions/component_loader.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_COMPONENT_LOADER_H_
 #define CHROME_BROWSER_EXTENSIONS_COMPONENT_LOADER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 85 matching lines @@
   void ClearAllRegistered();
 
   // Reloads a registered component extension.
   void Reload(const std::string& extension_id);
 
 #if defined(OS_CHROMEOS)
   // Calls |done_cb|, if not a null callback, on success.
   // NOTE: |done_cb| is not called if the component loader is shut down
   // during loading.
   void AddChromeVoxExtension(const base::Closure& done_cb);
-  std::string AddChromeOsSpeechSynthesisExtension();
+  void AddChromeOsSpeechSynthesisExtension();
 #endif
 
  private:
   // Information about a registered component extension.
   struct ComponentExtensionInfo {
     ComponentExtensionInfo(const base::DictionaryValue* manifest,
                            const base::FilePath& root_directory);
 
     // The parsed contents of the extensions's manifest file.
     const base::DictionaryValue* manifest;
@@ skipping 32 matching lines @@
   void AddKeyboardApp();
   void AddWebStoreApp();
 
   // Unloads |component| from the memory.
   void UnloadComponent(ComponentExtensionInfo* component);
 
   // Enable HTML5 FileSystem for given component extension in Guest mode.
   void EnableFileSystemInGuestMode(const std::string& id);
 
 #if defined(OS_CHROMEOS)
-  // Used as a reply callback when loading the ChromeVox extension.
-  // Called with a |chromevox_path| and parsed |manifest| and invokes
+  // Adds an extension where the manifest file is stored on the file system.
+  // |manifest_filename| can be relative to the |root_directory|.
+  void AddWithManifestFile(
+      const base::FilePath::CharType* manifest_filename,
+      const base::FilePath& root_directory,
+      const char* extension_id,
+      const base::Closure& done_cb);
+
+  // Used as a reply callback by |AddWithManifestFile|.
+  // Called with a |root_directory| and parsed |manifest| and invokes
   // |done_cb| after adding the extension.
-  void AddChromeVoxExtensionWithManifest(
-      const base::FilePath& chromevox_path,
+  void FinishAddWithManifestFile(
+      const base::FilePath& root_directory,
+      const char* extension_id,
       const base::Closure& done_cb,
       scoped_ptr<base::DictionaryValue> manifest);
 #endif
 
   PrefService* profile_prefs_;
   PrefService* local_state_;
   content::BrowserContext* browser_context_;
 
   ExtensionServiceInterface* extension_service_;
 
   // List of registered component extensions (see Manifest::Location).
   typedef std::vector<ComponentExtensionInfo> RegisteredComponentExtensions;
   RegisteredComponentExtensions component_extensions_;
 
   base::WeakPtrFactory<ComponentLoader> weak_factory_;
 
   FRIEND_TEST_ALL_PREFIXES(TtsApiTest, NetworkSpeechEngine);
   FRIEND_TEST_ALL_PREFIXES(TtsApiTest, NoNetworkSpeechEngineWhenOffline);
 
   DISALLOW_COPY_AND_ASSIGN(ComponentLoader);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_COMPONENT_LOADER_H_