Returning sourcePath from chrome.fileBrowserPrivate.addMount for gdata.

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 1069 matching lines @@
   chromeos::MountType mount_type =
       DiskMountManager::MountTypeFromString(mount_type_str);
   switch (mount_type) {
     case chromeos::MOUNT_TYPE_INVALID: {
       error_ = "Invalid mount type";
       SendResponse(false);
       break;
     }
     case chromeos::MOUNT_TYPE_GDATA: {
       const bool success = true;
+      // Pass back the gdata mount point path as source path.
+      const std::string& gdata_path =
+          gdata::util::GetGDataMountPointPathAsString();
+      SetResult(Value::CreateStringValue(gdata_path));
       FileBrowserEventRouterFactory::GetForProfile(profile_)->
           MountDrive(base::Bind(&AddMountFunction::SendResponse,
                                 this,
                                 success));
       break;
     }
     default: {
       UrlList file_paths;
       file_paths.push_back(GURL(file_url));
 
@@ skipping 1327 matching lines @@
   gdata::GDataSystemService* system_service =
       gdata::GDataSystemServiceFactory::GetForProfile(profile_);
   if (!system_service || !system_service->file_system())
     return false;
 
   FilePath directory_path = GetVirtualPathFromURL(GURL(file_url_as_string));
   system_service->file_system()->RequestDirectoryRefresh(directory_path);
 
   return true;
 }