Add chromium media control style sheet for media control default ui.

webkit/webkit.gyp

 # Copyright (c) 2009 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': {
     'feature_defines': [
       'ENABLE_CHANNEL_MESSAGING=1',
       'ENABLE_DATABASE=1',
       'ENABLE_DASHBOARD_SUPPORT=0',
@@ skipping 499 matching lines @@
           'action_name': 'UserAgentStyleSheets',
           'inputs': [
             '../third_party/WebKit/WebCore/css/make-css-file-arrays.pl',
             '../third_party/WebKit/WebCore/css/html4.css',
             '../third_party/WebKit/WebCore/css/quirks.css',
             '../third_party/WebKit/WebCore/css/view-source.css',
             '../third_party/WebKit/WebCore/css/themeWin.css',
             '../third_party/WebKit/WebCore/css/themeWinQuirks.css',
             '../third_party/WebKit/WebCore/css/svg.css',
             '../third_party/WebKit/WebCore/css/mediaControls.css',
+            '../third_party/WebKit/WebCore/css/mediaControlsChromium.css',
           ],
           'outputs': [
             '<(INTERMEDIATE_DIR)/UserAgentStyleSheets.h',
             '<(INTERMEDIATE_DIR)/UserAgentStyleSheetsData.cpp',
           ],
           'action': ['python', 'build/action_useragentstylesheets.py', '<@(_outputs)', '--', '<@(_inputs)'],
           'process_outputs_as_sources': 1,
         },
         {
           'action_name': 'XLinkNames',
@@ skipping 4308 matching lines @@
             '../third_party/WebKit/WebCore/inspector/front-end/Images/userInputPreviousIcon.png',
             '../third_party/WebKit/WebCore/inspector/front-end/Images/warningIcon.png',
             '../third_party/WebKit/WebCore/inspector/front-end/Images/warningMediumIcon.png',
             '../third_party/WebKit/WebCore/inspector/front-end/Images/warningsErrors.png',
           ],
         },
       ],
     },
   ],
 }