Media Remoting: Enhance contrast between interstitial and background.

third_party/WebKit/Source/core/css/mediaControls.css

 /*
  * Copyright (C) 2009 Apple Inc.  All rights reserved.
  * Copyright (C) 2015 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 155 matching lines @@
     position: absolute;
     margin: 0;
     top: 0px;
     left: 0px;
     width: 100%;
     height: 100%;
     border: none;
     border-width: 0px;
     background-color: transparent;
     padding: 0;
-    filter: grayscale(100%) blur(5px);
+    filter: grayscale(100%) blur(5px) opacity(40%);
 }
 
 video::-internal-media-remoting-cast-icon {
     -webkit-appearance: -internal-media-remoting-cast-icon;
     display: flex;
     position: absolute;
     margin: 0px;
     border-width: 0px;
     background-color: transparent;
     height: 18px;
@@ skipping 415 matching lines @@
     font-weight: bold;
 }
 
 video::cue(u) {
     text-decoration: underline;
 }
 
 video::cue(i) {
     font-style: italic;
 }