Gallery: Start to use new metadata model in Gallery.

ui/file_manager/gallery/js/compiled_resources.gyp

 # Copyright 2014 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': 'background',
       'variables': {
         'depends': [
           '../../../../third_party/jstemplate/compiled_resources.gyp:jstemplate',
@@ skipping 59 matching lines @@
           '../../file_manager/foreground/js/metadata/exif_constants.js',
           '../../file_manager/foreground/js/metadata/external_metadata_provider.js',
           '../../file_manager/foreground/js/metadata/file_system_metadata_provider.js',
           '../../file_manager/foreground/js/metadata/metadata_cache.js',
           '../../file_manager/foreground/js/metadata/metadata_cache_item.js',
           '../../file_manager/foreground/js/metadata/metadata_cache_set.js',
           '../../file_manager/foreground/js/metadata/metadata_item.js',
           '../../file_manager/foreground/js/metadata/metadata_model.js',
           '../../file_manager/foreground/js/metadata/multi_metadata_provider.js',
           '../../file_manager/foreground/js/metadata/new_metadata_provider.js',
+          '../../file_manager/foreground/js/metadata/thumbnail_model.js',
           '../../file_manager/foreground/js/mouse_inactivity_watcher.js',
           '../../file_manager/foreground/js/share_client.js',
           '../../file_manager/foreground/js/thumbnail_loader.js',
           '../../file_manager/foreground/js/ui/file_manager_dialog_base.js',
           '../../file_manager/foreground/js/ui/share_dialog.js',
           '../../file_manager/foreground/js/volume_manager_wrapper.js',
           '../../file_manager/background/js/volume_manager.js',
           '../../image_loader/image_loader_client.js',
           './image_editor/commands.js',
           './image_editor/exif_encoder.js',
@@ skipping 27 matching lines @@
           '../../externs/platform.js',
           '../../externs/webview_tag.js',
         ],
       },
       'includes': [
         '../../../../third_party/closure_compiler/compile_js.gypi'
       ],
     }
   ],
 }