Fix for the chrome://cast hash logic to support page reloads.

chrome/browser/resources/cast/cast.js

 // Copyright 2016 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.
 
 window.addEventListener('load', function init() {
   var extensionView = document.querySelector('extensionview');
 
   /**
    * @param {string} str
    * @return {!Array<string>}
@@ skipping 16 matching lines @@
 
   window.addEventListener('hashchange', function() {
     var newHash = window.location.hash.substr(1);
     var extensionViewSrcParts = splitUrlOnHash(
         extensionView.getAttribute('src'));
     if (newHash !== extensionViewSrcParts[1]) {
       extensionView.load(extensionViewSrcParts[0] + '#' + newHash);
     }
   });
 
-  extensionView.load('chrome-extension://' +
-      loadTimeData.getString('extensionId') + '/cast_setup/devices.html');
+  extensionView.load(
+      'chrome-extension://' + loadTimeData.getString('extensionId') +
+      '/cast_setup/index.html#' + window.location.hash.substr(1) || 'devices');
 });