[Media Router WebUI] Move replace route responsibility to extension

chrome/browser/resources/media_router/media_router.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.
 
 <include src="media_router_data.js">
 <include src="media_router_ui_interface.js">
 
 // Handles user events for the Media Router UI.
 cr.define('media_router', function() {
   'use strict';
@@ skipping 17 matching lines @@
         ($('media-router-container'));
 
     media_router.ui.setElements(container,
         /** @type {!MediaRouterHeaderElement} */
         (container.$['container-header']));
 
     container.addEventListener('acknowledge-first-run-flow',
                                onAcknowledgeFirstRunFlow);
     container.addEventListener('back-click', onNavigateToSinkList);
     container.addEventListener('cast-mode-selected', onCastModeSelected);
+    container.addEventListener('change-route-source-click',
+                               onChangeRouteSourceClick);
     container.addEventListener('close-dialog', onCloseDialog);
     container.addEventListener('close-route', onCloseRoute);
     container.addEventListener('create-route', onCreateRoute);
     container.addEventListener('issue-action-click', onIssueActionClick);
     container.addEventListener('join-route-click', onJoinRouteClick);
     container.addEventListener('navigate-sink-list-to-details',
                                onNavigateToDetails);
     container.addEventListener('navigate-to-cast-mode-list',
                                onNavigateToCastMode);
     container.addEventListener('report-filter', onFilter);
@@ skipping 42 matching lines @@
    * Parameters in |event|.detail:
    *   castModeType - type of cast mode selected by the user.
    */
   function onCastModeSelected(event) {
     /** @type {{castModeType: number}} */
     var detail = event.detail;
     media_router.browserApi.reportSelectedCastMode(detail.castModeType);
   }
 
   /**
+   * Reports the route for which the users wants to replace the source and the
+   * cast mode that should be used for the new source.
+   *
+   * @param {!Event} event The event object.
+   * Parameters in |event|.detail:
+   *   route - route to modify.
+   *   selectedCastMode - type of cast mode selected by the user.
+   */
+  function onChangeRouteSourceClick(event) {
+    /** @type {{route: !media_router.Route, selectedCastMode: number}} */
+    var detail = event.detail;
+    media_router.browserApi.changeRouteSource(
+        detail.route, detail.selectedCastMode);
+  }
+
+  /**
    * Updates the preference that the user has seen the first run flow.
    * Called when the user clicks on the acknowledgement button on the first run
    * flow.
    *
    * @param {!Event} event
    * Parameters in |event|.detail:
    *   optedIntoCloudServices - whether or not the user opted into cloud
    *                            services.
    */
   function onAcknowledgeFirstRunFlow(event) {
@@ skipping 252 matching lines @@
   function onWindowBlur() {
     media_router.browserApi.reportBlur();
   }
 
   return {
     initialize: initialize,
   };
 });
 
 window.addEventListener('load', media_router.initialize);