Fix for making gdata drive R/W in UI.

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
 const SIMULTANEOUS_RESCAN_INTERVAL = 1000;
 
 /**
  * Data model of the file manager.
@@ skipping 118 matching lines @@
    * @type {boolean}
    */
   get readonly() {
     switch (this.rootType) {
       case DirectoryModel.RootType.REMOVABLE:
         return this.readonly_;
       case DirectoryModel.RootType.ARCHIVE:
         return true;
       case DirectoryModel.RootType.DOWNLOADS:
         return false;
+      case DirectoryModel.RootType.GDATA:
+        return false;
       default:
         return true;
     }
   },
 
   set readonly(value) {
     if (this.rootType == DirectoryModel.RootType.REMOVABLE) {
       this.readonly_ = !!value;
     }
   },
@@ skipping 758 matching lines @@
 
   recordMetrics_: function() {
     metrics.recordInterval('DirectoryScan');
     if (this.dir_.fullPath ==
         '/' + DirectoryModel.DOWNLOADS_DIRECTORY) {
       metrics.recordMediumCount("DownloadsCount", this.list_.length);
     }
   }
 };