Fix black background when locking with fullscreen window:

ui/ui.gyp

 # 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': {
     'chromium_code': 1,
   },
   'includes': [
     'ui_resources.gypi',
@@ skipping 43 matching lines @@
         'base/accessibility/accessible_text_utils.cc',
         'base/accessibility/accessible_text_utils.h',
         'base/accessibility/accessible_view_state.cc',
         'base/accessibility/accessible_view_state.h',
         'base/animation/animation.cc',
         'base/animation/animation.h',
         'base/animation/animation_container.cc',
         'base/animation/animation_container.h',
         'base/animation/animation_container_element.h',
         'base/animation/animation_container_observer.h',
+        'base/animation/animation_container_test_helper.cc',
+        'base/animation/animation_container_test_helper.h',
         'base/animation/animation_delegate.h',
         'base/animation/linear_animation.cc',
         'base/animation/linear_animation.h',
         'base/animation/multi_animation.cc',
         'base/animation/multi_animation.h',
         'base/animation/slide_animation.cc',
         'base/animation/slide_animation.h',
         'base/animation/throb_animation.cc',
         'base/animation/throb_animation.h',
         'base/animation/tween.cc',
@@ skipping 814 matching lines @@
            },
            'dependencies': [
              '../base/base.gyp:base_java',
            ],
            'includes': [ '../build/java.gypi' ],
          },
        ],
     }],
   ],
 }