Implementation of chrome://cast page.

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() {
+  chrome.send('requestExtensionId');
+});
+
+/** @param {string} extensionId */
+window['setExtensionId'] = function(extensionId) {
+  var ev = document.querySelector('extensionview');
+
+  /**
+   * @param {string} str
+   * @return {!Array<string>}
+   */
+  var splitUrlOnHash = function(str) {
+    str = str || '';
+    var pos = str.indexOf('#');
+    return (pos !== -1) ? [str.substr(0, pos), str.substr(pos + 1)] : [str, ''];
+  };
+
+  new MutationObserver(function() {
+    var newHash = splitUrlOnHash(ev.getAttribute('src'))[1];
+    var oldHash = window.location.hash.substr(1);
+    if (newHash !== oldHash) {
+      window.location.hash = newHash;
+    }
+  }).observe(ev, {
+    attributes: true
+  });
+
+  window.addEventListener('hashchange', function() {
+    var newHash = window.location.hash.substr(1);
+    var evSrcParts = splitUrlOnHash(ev.getAttribute('src'));
+    if (newHash !== evSrcParts[1]) {
+      ev.load(evSrcParts[0] + '#' + newHash);
+    }
+  });
+
+  ev.load('chrome-extension://' + extensionId + '/cast_setup/devices.html');
+};
+