Created uber tray UI for monitoring ongoing WebDrive sync operations

ash/system/drive/drive_observer.h

Index: ash/system/drive/drive_observer.h
diff --git a/ash/system/drive/drive_observer.h b/ash/system/drive/drive_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..0c7200ccea490a91a8b3d094198b6227d1a9b712
--- /dev/null
+++ b/ash/system/drive/drive_observer.h
@@ -0,0 +1,23 @@
+// 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.
+
+#ifndef ASH_SYSTEM_DRIVE_DRIVE_OBSERVER_H_
+#define ASH_SYSTEM_DRIVE_DRIVE_OBSERVER_H_
+#pragma once
+
+#include <vector>

[sadrul, 2012/05/01 14:28:58]

nit: You probably don't need this here.

[zel, 2012/05/01 16:56:52]

Done.

+#include "ash/system/tray/system_tray_delegate.h"

[xiyuan, 2012/05/01 16:47:53]

nit: seems this one is not used either.

+
+namespace ash {
+
+class DriveObserver {
+ public:
+  virtual ~DriveObserver() {}
+
+  virtual void OnDriveRefresh(const DriveOperationStatusList& list) = 0;
+};
+
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_DRIVE_DRIVE_OBSERVER_H_