[File Manager] Properly enable/disable Copy and Open for GData files in the offline mode.

chrome/browser/resources/file_manager/js/directory_model.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.
 
 // If directory files changes too often, don't rescan directory more than once
 // per specified interval
 var SIMULTANEOUS_RESCAN_INTERVAL = 1000;
 // Used for operations that require almost instant rescan.
 var SHORT_RESCAN_INTERVAL = 100;
 
@@ skipping 143 matching lines @@
   get offline() {
     return this.offline_;
   },
   set offline(value) {
     if (this.offline_ != value) {
       this.offline_ = !!value;
       this.updateReadonlyStatus_();
     }
   },
 
-  get isSystemDirectoy() {
+  get isOnGData() {
+    return this.rootPath == '/' + DirectoryModel.GDATA_DIRECTORY;
+  },
+
+  get isSystemDirectory() {
     var path = this.currentEntry.fullPath;
     return path == '/' ||
            path == '/' + DirectoryModel.REMOVABLE_DIRECTORY ||
            path == '/' + DirectoryModel.ARCHIVE_DIRECTORY;
   },
 
   get filterHidden() {
     return !!this.filters_['hidden'];
   },
 
@@ skipping 1072 matching lines @@
 /**
  * @private
  */
 DirectoryModel.Scanner.prototype.recordMetrics_ = function() {
   metrics.recordInterval('DirectoryScan');
   if (this.dir_.fullPath ==
       '/' + DirectoryModel.DOWNLOADS_DIRECTORY) {
     metrics.recordMediumCount('DownloadsCount', this.list_.length);
   }
 };