[File Manager] Add/remove Google Drive folder in the open File Manager when Drive enabled/disabled …

chrome/browser/resources/file_manager/js/mock_chrome.js

 // Copyright (c) 2012 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.
 
 function MockEventSource() {
   this.listeners_ = [];
 }
 
 /**
  * Add a listener. There is no remove.
  * @param {function} listener A callback function.
  */
 MockEventSource.prototype.addListener = function(listener) {
   this.listeners_.push(listener);
 };
 
 /**
  * Notify listeners in a fresh call stack.
  * @param {Object...} var_args Arguments.
  */
 MockEventSource.prototype.notify = function(var_args) {
   setTimeout(function(args) {
     for (var i = 0; i != this.listeners_.length; i++) {
       this.listeners_[i].apply(null, args);
     }
   }.bind(this, arguments), 0);
 };
 
+function cloneShallow(object) {
+  var clone = {};
+  for (var key in object)
+    if (object.hasOwnProperty(key))
+      clone[key] = object[key];
+  return clone;
+}
+
 /**
  * Mock out the chrome.fileBrowserPrivate API for use in the harness.
  */
 chrome.fileBrowserPrivate = {
 
   /**
    * Return a normal HTML5 filesystem api, rather than the real local
    * filesystem.
    *
    * You must start chrome with --allow-file-access-from-files and
@@ skipping 281 matching lines @@
       response.push({
         fileUrl: url,
         isHosted: url.match(/\.g(doc|slides|sheet|draw|table)$/i),
         isPinned: (url in chrome.fileBrowserPrivate.pinned_)
       });
     }
     setTimeout(callback, 0, response);
   },
 
   gdataPreferences_: {
+    driveEnabled: true,
     cellularDisabled: true,
     hostedFilesDisabled: false
   },
 
   onGDataPreferencesChanged: new MockEventSource(),
 
   getGDataPreferences: function(callback) {
-    setTimeout(callback, 0, chrome.fileBrowserPrivate.gdataPreferences_);
+    setTimeout(callback, 0, cloneShallow(
+        chrome.fileBrowserPrivate.gdataPreferences_));
   },
 
   setGDataPreferences: function(preferences) {
     for (var prop in preferences) {
       chrome.fileBrowserPrivate.gdataPreferences_[prop] = preferences[prop];
     }
     chrome.fileBrowserPrivate.onGDataPreferencesChanged.notify();
   },
 
   networkConnectionState_: {
     type: 'cellular',
     online: true
   },
 
   onNetworkConnectionChanged: new MockEventSource(),
 
   getNetworkConnectionState: function(callback) {
-    setTimeout(callback, 0, chrome.fileBrowserPrivate.networkConnectionState_);
+    setTimeout(callback, 0, cloneShallow(
+        chrome.fileBrowserPrivate.networkConnectionState_));
   },
 
   setConnectionState_: function(state) {
     chrome.fileBrowserPrivate.networkConnectionState_ = state;
     chrome.fileBrowserPrivate.onNetworkConnectionChanged.notify();
   },
 
   pinGDataFile: function(urls, on, callback) {
     for (var i = 0; i != urls.length; i++) {
       var url = urls[i];
@@ skipping 16 matching lines @@
   isFullscreen: function(callback) {
     setTimeout(callback, 0, document.webkitIsFullScreen);
   },
 
   /**
    * Return localized strings.
    */
   getStrings: function(callback) {
     // Keep this list in sync with the strings in generated_resources.grd and
     // extension_file_browser_private_api.cc!
-    callback({
+    setTimeout(callback, 0, {
       // These two are from locale_settings*.grd
       WEB_FONT_FAMILY: 'Open Sans,Chrome Droid Sans,' +
                        'Droid Sans Fallback,sans-serif',
       WEB_FONT_SIZE: '84%',
 
       FILE_IS_DIRECTORY: 'Folder',
 
       GDATA_DIRECTORY_LABEL: 'Google Drive',
       ENABLE_GDATA: '1',
       PDF_VIEW_ENABLED: 'true',
@@ skipping 300 matching lines @@
 
   setWindowHeight: function(height) {
     this.popup_.style.height = height + 'px';
   },
 
   closeWindow: function() {
     this.popup_.parentNode.removeChild(this.popup_);
     this.popup_ = null;
   }
 };