Video Player: Add a cast menu

ui/file_manager/video_player/js/cast/caster.js

+// Copyright 2014 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.
+
+'use strict';
+
+/**
+ * The instance of cast api.
+ * @type {cast.ExtensionApi}
+ */
+var castApi = null;
+
+/**
+ * @type {string}
+ * @const
+ */
+var CAST_COMMAND_LINE_FLAG = 'enable-video-player-chromecast-support';
+
+chrome.commandLinePrivate.hasSwitch(CAST_COMMAND_LINE_FLAG, function(result) {
+  if (!result)
+    return;
+
+  CastExtensionDiscoverer.findInstalledExtension(onCastExtensionFound);
+});
+
+function onCastExtensionFound(extensionId) {
+  if (!extensionId) {
+    console.info('Cast extention is not found.');
+    return;
+  }
+
+  var api = document.createElement('script');
+  api.src = 'chrome-extension://' + extensionId + '/api_script.js';
+  api.onload = function() {
+    initializeCast(extensionId);
+  };
+  api.onerror = function() {
+    console.error('api_script.js load failed.');
+  };
+  document.body.appendChild(api);
+};
+
+function initializeCast(extensionId) {
+  loadCastExtensionApi();
+
+  castApi = new cast.ExtensionApi(extensionId);
+  castApi.addReceiverListener('ChromeCast', onReceiverUpdate);
+}
+
+function onReceiverUpdate(receivers) {
+  player.setCastList(receivers);
+}