gdata: Fix issue with copying hosted documents out from Docs folder.

chrome/browser/chromeos/extensions/file_browser_private_api.cc

 // 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.
 
 #include "chrome/browser/chromeos/extensions/file_browser_private_api.h"
 
 #include <utility>
 
 #include "base/base64.h"
 #include "base/bind.h"
@@ skipping 1034 matching lines @@
   // We check permissions for raw cache file paths only for read-only
   // operations (when fileEntry.file() is called), so read only permissions
   // should be sufficient for all cache paths. For the rest of supported
   // operations the file access check is done for gdata/ paths.
   GrantFilePermissionsToHost(gdata_file_system->GetGDataCacheTmpDirectory(),
                              file_handler_util::GetReadOnlyPermissions());
   GrantFilePermissionsToHost(
       gdata_file_system->GetGDataCachePersistentDirectory(),
       file_handler_util::GetReadOnlyPermissions());
 
+  // Grant read-only permission for directory hosting temporary gdata document
+  // JSON files.
+  GrantFilePermissionsToHost(gdata_file_system->GetGDataTempDocumentDirectory(),
+                             file_handler_util::GetReadOnlyPermissions());
+
   provider->AddRemoteMountPoint(
       mount_point,
       new gdata::GDataFileSystemProxy(gdata_file_system));
 
   FilePath mount_point_virtual;
   if (provider->GetVirtualPath(mount_point, &mount_point_virtual))
     provider->GrantFileAccessToExtension(extension_id(), mount_point_virtual);
 }
 
 void AddMountFunction::RaiseGDataMountEvent(gdata::GDataErrorCode error) {
@@ skipping 869 matching lines @@
       local_source_file,
       remote_destination_file,
       base::Bind(&TransferFileFunction::OnTransferCompleted,
                  this));
 }
 
 void TransferFileFunction::OnTransferCompleted(
     base::PlatformFileError error) {
   SendResponse(error == base::PLATFORM_FILE_OK);
 }