android: Implement single origin and CORS check for video

tools/metrics/histograms/histograms.xml

 <!--
 Copyright 2013 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.
 -->
 
 <!--
 This file is used to generate a comprehensive list of Chrome histograms along
 with a detailed description for each histogram.
 
@@ skipping 3349 matching lines @@
 <histogram name="Media.HardwareAudioSamplesPerSecond" enum="AudioSampleRate">
   <summary>Samples per second of the hardware audio device.</summary>
 </histogram>
 
 <histogram name="Media.HardwareAudioSamplesPerSecondUnexpected" units="Hz">
   <summary>
     Samples per second of the hardware audio device (atypical values, in Hz).
   </summary>
 </histogram>
 
+<histogram name="Media.InfoLoadDelay" units="milliseconds">
+  <summary>
+    The time it takes to perform redirect tracking and a CORS access check while
+    preparing to play a media file.
+  </summary>
+</histogram>
+
 <histogram name="Media.LinuxAudioIO" enum="LinuxAudioIO">
   <summary>
     Audio IO layer used by the Linux OS, sampled once at startup of the browser.
   </summary>
 </histogram>
 
 <histogram name="Media.MSE.AudioCodec" enum="MSECodec">
   <summary>
     Audio codec used in Media Source Extensions playback. Set when AddId() is
     called during playback.
@@ skipping 14954 matching lines @@
   <group name="Disabled" label="Neither extra webstore link is visible"/>
   <group name="FooterLink" label="Link in bottom right of footer"/>
   <group name="PlusIcon" label="Plus icon in apps page"/>
   <affected-histogram name="Extensions.AppLaunch"/>
   <affected-histogram name="NewTabPage.DefaultPageType"/>
 </fieldtrial>
 
 </fieldtrials>
 
 </histogram-configuration>