Extend the capability of SystemMonitor to support watching storage free space change

chrome/browser/system_monitor/media_device_notifications_chromeos.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.
 
 // chromeos::MediaDeviceNotifications implementation.
 
 #include "chrome/browser/system_monitor/media_device_notifications_chromeos.h"
 
 #include "base/file_path.h"
 #include "base/logging.h"
@@ skipping 142 matching lines @@
 
   std::string device_id = chrome::MediaStorageUtil::MakeDeviceId(
       chrome::MediaStorageUtil::REMOVABLE_MASS_STORAGE_WITH_DCIM, unique_id);
   mount_map_.insert(std::make_pair(mount_info.mount_path, device_id));
   base::SystemMonitor::Get()->ProcessRemovableStorageAttached(
       device_id,
       device_label,
       mount_info.mount_path);
 }
 
+bool MediaDeviceNotifications::StartWatchingStorage(
+    const FilePath::StringType& path) {
+  // TODO(hongbo): Add the implementation for chromeos.

[vandebo (ex-Chrome), 2012/09/10 21:52:49]

Nothing will break if this isn't here, so don't add these until you have the
implementation to add.

+  return false;
+}
+
+bool MediaDeviceNotifications::StopWatchingStorage(
+    const FilePath::StringType& path) {
+  // TODO(hongbo): Add the implementation for chromeos.
+  return false;
+}
+
 }  // namespace chrome