Video Player: Support Media Router to cast Drive videos.

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

Index: ui/file_manager/video_player/js/cast/caster.js
diff --git a/ui/file_manager/video_player/js/cast/caster.js b/ui/file_manager/video_player/js/cast/caster.js
index 50b26dd8d9b129b55a6b36fae0b0d48ab4becf7f..91f6e0fa8bbf3f78f7064351272086d79472712f 100644
--- a/ui/file_manager/video_player/js/cast/caster.js
+++ b/ui/file_manager/video_player/js/cast/caster.js
@@ -132,6 +132,12 @@ function initializeApi() {
  * @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.');