[Media Router WebUI] Move replace route responsibility to extension

chrome/browser/resources/media_router/media_router_ui_interface.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.
 
 // API invoked by the browser MediaRouterWebUIMessageHandler to communicate
 // with this UI.
 cr.define('media_router.ui', function() {
   'use strict';
 
   // The media-router-container element.
@@ skipping 185 matching lines @@
    * @param {string} issueId
    * @param {number} actionType Type of action that the user clicked.
    * @param {?number} helpPageId The numeric help center ID.
    */
   function actOnIssue(issueId, actionType, helpPageId) {
     chrome.send('actOnIssue', [{issueId: issueId, actionType: actionType,
                                 helpPageId: helpPageId}]);
   }
 
   /**
+   * Modifies |route| by changing its source to the one identified by
+   * |selectedCastMode|.
+   *
+   * @param {!media_router.Route} route The route being modified.
+   * @param {number} selectedCastMode The value of the cast mode the user
+   *   selected.
+   */
+  function changeRouteSource(route, selectedCastMode) {
+    chrome.send('requestRoute',
+                [{sinkId: route.sinkId, selectedCastMode: selectedCastMode}]);
+  }
+
+  /**
    * Closes the dialog.
    *
    * @param {boolean} pressEscToClose Whether the user pressed ESC to close the
    *                  dialog.
    */
   function closeDialog(pressEscToClose) {
     chrome.send('closeDialog', [pressEscToClose]);
   }
 
   /**
@@ skipping 164 matching lines @@
     chrome.send('searchSinksAndCreateRoute',
                 [{sinkId: sinkId,
                   searchCriteria: searchCriteria,
                   domain: domain,
                   selectedCastMode: selectedCastMode}]);
   }
 
   return {
     acknowledgeFirstRunFlow: acknowledgeFirstRunFlow,
     actOnIssue: actOnIssue,
+    changeRouteSource: changeRouteSource,
     closeDialog: closeDialog,
     closeRoute: closeRoute,
     joinRoute: joinRoute,
     onInitialDataReceived: onInitialDataReceived,
     reportBlur: reportBlur,
     reportClickedSinkIndex: reportClickedSinkIndex,
     reportFilter: reportFilter,
     reportInitialAction: reportInitialAction,
     reportInitialState: reportInitialState,
     reportNavigateToView: reportNavigateToView,
     reportRouteCreation: reportRouteCreation,
     reportRouteCreationOutcome: reportRouteCreationOutcome,
     reportSelectedCastMode: reportSelectedCastMode,
     reportSinkCount: reportSinkCount,
     reportTimeToClickSink: reportTimeToClickSink,
     reportTimeToInitialActionClose: reportTimeToInitialActionClose,
     requestInitialData: requestInitialData,
     requestRoute: requestRoute,
     searchSinksAndCreateRoute: searchSinksAndCreateRoute,
   };
 });