Video Player: Support Media Router to cast Drive videos.

ui/file_manager/video_player/js/cast/caster.js

 // Copyright 2014 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 hack prevents a bug on the cast extension.
 // TODO(yoshiki): Remove this once the cast extension supports Chrome apps.
 // Although localStorage in Chrome app is not supported, but it's used in the
 // cast extension. This line prevents an exception on using localStorage.
 Object.defineProperty(window, 'localStorage', {
   get: function() { return {}; }
@@ skipping 114 matching lines @@
 }
 
 /**
  * Called when receiver availability is changed. This method is also called when
  * initialization is completed.
  *
  * @param {chrome.cast.ReceiverAvailability} availability Availability of casts.
  * @param {Array<Object>} receivers List of casts.
  */
 function onReceiver(availability, receivers) {
+  if (chrome.cast.usingPresentationApi) {
+    player.setCastAvailability(
+        availability === chrome.cast.ReceiverAvailability.AVAILABLE);
+    return;
+  }
+
   if (availability === chrome.cast.ReceiverAvailability.AVAILABLE) {
     if (!receivers) {
       console.error('Receiver list is empty.');
       receivers = [];
     }
 
     metrics.recordNumberOfCastDevices(receivers.length);
     player.setCastList(receivers);
   } else if (availability == chrome.cast.ReceiverAvailability.UNAVAILABLE) {
     metrics.recordNumberOfCastDevices(0);
     player.setCastList([]);
   } else {
     console.error('Unexpected response in onReceiver.', arguments);
     player.setCastList([]);
   }
 }