Media Gallery: Implement a basic version of GetMediaFileSystems().

chrome/chrome_browser.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
@@ skipping 1325 matching lines @@
         'browser/media/media_internals.cc',
         'browser/media/media_internals.h',
         'browser/media/media_stream_capture_indicator.cc',
         'browser/media/media_stream_capture_indicator.h',
         'browser/media/media_stream_devices_menu_model.cc',
         'browser/media/media_stream_devices_menu_model.h',
         'browser/media_gallery/media_device_notifications_linux.cc',
         'browser/media_gallery/media_device_notifications_linux.h',
         'browser/media_gallery/media_device_notifications_window_win.cc',
         'browser/media_gallery/media_device_notifications_window_win.h',
+        'browser/media_gallery/media_file_system_registry.cc',
+        'browser/media_gallery/media_file_system_registry.h',
         'browser/media_gallery/media_gallery_database.cc',
         'browser/media_gallery/media_gallery_database.h',
         'browser/media_gallery/media_gallery_database_types.cc',
         'browser/media_gallery/media_gallery_database_types.h',
         'browser/memory_details.cc',
         'browser/memory_details.h',
         'browser/memory_details_android.cc',
         'browser/memory_details_linux.cc',
         'browser/memory_details_mac.cc',
         'browser/memory_details_win.cc',
@@ skipping 3746 matching lines @@
         'browser/metrics/proto/study.proto',
       ],
       'variables': {
         'proto_in_dir': 'browser/metrics/proto',
         'proto_out_dir': 'chrome/browser/metrics/proto',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }