[Media Router] Add a supports_web_ui_controller attribute to MediaRoute

chrome/browser/resources/media_router/media_router_data.js

 // Copyright 2015 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.
 
 // Any strings used here will already be localized. Values such as
 // CastMode.type or IDs will be defined elsewhere and determined later.
 
 cr.exportPath('media_router');
 
 /**
@@ skipping 203 matching lines @@
     this.isLocal = isLocal;
 
     /** @type {boolean} */
     this.canJoin = canJoin;
 
     /** @type {number|undefined} */
     this.currentCastMode = undefined;
 
     /** @type {?string} */
     this.customControllerPath = customControllerPath;
+
+    /** @type {boolean} */
+    this.supportsWebUiController = false;

[imcheng, 2017/06/16 00:12:32]

This value should be supplied by the constructor, right?

[takumif, 2017/06/16 18:16:52]

The ctor is only used by tests, and since most of the tests don't care about
this value, I thought it'd be okay not to.

   };
 
   /**
    * @param {string} title The title of the route.
    * @param {string} description A description for the route.
    * @param {boolean} canPlayPause Whether the route can be played/paused.
    * @param {boolean} canMute Whether the route can be muted/unmuted.
    * @param {boolean} canSetVolume Whether the route volume can be changed.
    * @param {boolean} canSeek Whether the route's playback position can be
    *     changed.
@@ skipping 101 matching lines @@
   return {
     AUTO_CAST_MODE: AUTO_CAST_MODE,
     CastMode: CastMode,
     Issue: Issue,
     Route: Route,
     RouteStatus: RouteStatus,
     Sink: Sink,
     TabInfo: TabInfo,
   };
 });