Add a refresh button for providers which do not support watchers.

chrome/browser/chromeos/extensions/file_manager/private_api_util.cc

 // Copyright 2013 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_manager/private_api_util.h"
 
 #include <string>
 
 #include "base/files/file_path.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 182 matching lines @@
       volume_metadata->source =
           extensions::api::file_manager_private::SOURCE_NETWORK;
       break;
     case SOURCE_SYSTEM:
       volume_metadata->source =
           extensions::api::file_manager_private::SOURCE_SYSTEM;
       break;
   }
 
   volume_metadata->configurable = volume.configurable();
+  volume_metadata->watchable = volume.watchable();
 
   if (volume.type() == VOLUME_TYPE_PROVIDED) {
     volume_metadata->extension_id.reset(new std::string(volume.extension_id()));
     volume_metadata->file_system_id.reset(
         new std::string(volume.file_system_id()));
   }
 
   volume_metadata->volume_label.reset(new std::string(volume.volume_label()));
 
   switch (volume.type()) {
@@ skipping 145 matching lines @@
 }
 
 drive::EventLogger* GetLogger(Profile* profile) {
   drive::DriveIntegrationService* service =
       drive::DriveIntegrationServiceFactory::FindForProfile(profile);
   return service ? service->event_logger() : NULL;
 }
 
 }  // namespace util
 }  // namespace file_manager