add unit tests for MediaGalleriesDialogGtk

chrome/chrome_tests.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.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 1788 matching lines @@
         'browser/ui/constrained_window_tab_helper_unittest.cc',
         'browser/ui/content_settings/content_setting_bubble_model_unittest.cc',
         'browser/ui/content_settings/content_setting_image_model_unittest.cc',
         'browser/ui/find_bar/find_backend_unittest.cc',
         'browser/ui/global_error/global_error_service_unittest.cc',
         'browser/ui/gtk/accelerators_gtk_unittest.cc',
         'browser/ui/gtk/bookmarks/bookmark_bar_gtk_unittest.cc',
         'browser/ui/gtk/bookmarks/bookmark_editor_gtk_unittest.cc',
         'browser/ui/gtk/bookmarks/bookmark_utils_gtk_unittest.cc',
         'browser/ui/gtk/event_utils_unittest.cc',
+        'browser/ui/gtk/extensions/media_galleries_dialog_gtk_unittest.cc',
         'browser/ui/gtk/gtk_chrome_shrinkable_hbox_unittest.cc',
         'browser/ui/gtk/gtk_theme_service_unittest.cc',
         'browser/ui/gtk/omnibox/omnibox_popup_view_gtk_unittest.cc',
         'browser/ui/gtk/reload_button_gtk_unittest.cc',
         'browser/ui/gtk/status_icons/status_tray_gtk_unittest.cc',
         'browser/ui/gtk/tabs/tab_renderer_gtk_unittest.cc',
         'browser/ui/intents/web_intent_inline_disposition_delegate_unittest.cc',
         'browser/ui/intents/web_intent_picker_model_unittest.cc',
         'browser/ui/intents/web_intent_picker_unittest.cc',
         'browser/ui/intents/web_intents_model_unittest.cc',
@@ skipping 2850 matching lines @@
                 '--result', '<@(_outputs)',
                 '--isolate', 'browser_tests.isolate',
               ],
             },
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }