Video Player: Show the appropriate error message on casting unsupported video

ui/file_manager/video_player/js/cast/cast_video_element.js

Index: ui/file_manager/video_player/js/cast/cast_video_element.js
diff --git a/ui/file_manager/video_player/js/cast/cast_video_element.js b/ui/file_manager/video_player/js/cast/cast_video_element.js
index f436c9a0a0febe3d33aa01af3f8ac2b802262aec..196f840ec5444571a29519fd8d7e534af44e7d08 100644
--- a/ui/file_manager/video_player/js/cast/cast_video_element.js
+++ b/ui/file_manager/video_player/js/cast/cast_video_element.js
@@ -41,6 +41,7 @@ function CastVideoElement(media, session) {
   this.currentMediaDuration_ = null;
   this.playInProgress_ = false;
   this.pauseInProgress_ = false;
+  this.errorCode_ = 0;
 
   this.onMessageBound_ = this.onMessage_.bind(this);
   this.onCastMediaUpdatedBound_ = this.onCastMediaUpdated_.bind(this);
@@ -189,6 +190,17 @@ CastVideoElement.prototype = {
   },
 
   /**
+   * Returns the error object if available.
+   * @type {?Object}
+   */
+  get error() {
+    if (this.errorCode_ === 0)
+      return null;
+
+    return {code: this.errorCode_};
+  },
+
+  /**
    * Plays the video.
    */
   play: function() {
@@ -238,6 +250,9 @@ CastVideoElement.prototype = {
       this.sendMessage_({message: 'push-token', token: token});
     }.bind(this));
 
+    // Resets the error code.
+    this.errorCode_ = 0;
+
     Promise.all([
       sendTokenPromise,
       this.mediaManager_.getUrl(),
@@ -287,6 +302,7 @@ CastVideoElement.prototype = {
       this.castMedia_.removeUpdateListener(this.onCastMediaUpdatedBound_);
       this.castMedia_ = null;
     }
+
     clearInterval(this.updateTimerId_);
   },
 
@@ -325,6 +341,9 @@ CastVideoElement.prototype = {
         console.error(
             'New token is requested, but the previous token mismatches.');
       }
+    } else if (message['message'] === 'playback-error') {
+      if (message['detail'] === 'src-not-supported')
+        this.errorCode_ = MediaError.MEDIA_ERR_SRC_NOT_SUPPORTED;
     }
   },