Media Galleries API Scanning: Add Scan Permission and basic test.

chrome/browser/extensions/api/media_galleries/media_galleries_api.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.
 
 // Defines the Chrome Extensions Media Galleries API functions for accessing
 // user's media files, as specified in the extension API IDL.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_MEDIA_GALLERIES_MEDIA_GALLERIES_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_MEDIA_GALLERIES_MEDIA_GALLERIES_API_H_
 
@@ skipping 29 matching lines @@
   static MediaGalleriesEventRouter* Get(Profile* profile);
 
   bool ExtensionHasScanProgressListener(const std::string& extension_id) const;
 
   // MediaScanManagerObserver implementation.
   virtual void OnScanStarted(const std::string& extension_id) OVERRIDE;
   virtual void OnScanCancelled(const std::string& extension_id) OVERRIDE;
   virtual void OnScanFinished(
       const std::string& extension_id, int gallery_count, int image_count,
       int audio_count, int video_count) OVERRIDE;
+  virtual void OnScanError(const std::string& extension_id) OVERRIDE;
 
  private:
   friend class ProfileKeyedAPIFactory<MediaGalleriesEventRouter>;
 
   void DispatchEventToExtension(const std::string& extension_id,
                                 const std::string& event_name,
                                 scoped_ptr<base::ListValue> event_args);
 
   explicit MediaGalleriesEventRouter(Profile* profile);
   virtual ~MediaGalleriesEventRouter();
@@ skipping 168 matching lines @@
   // Bottom half for RunImpl, invoked after the preferences is initialized.
   void OnPreferencesInit(bool mime_type_only, const std::string& blob_uuid);
 
   void SniffMimeType(bool mime_type_only, scoped_ptr<std::string> blob_header,
                      int64 total_blob_length);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_MEDIA_GALLERIES_MEDIA_GALLERIES_API_H_