Created uber tray UI for monitoring ongoing WebDrive sync operations

ash/system/drive/tray_drive.h

Index: ash/system/drive/tray_drive.h
diff --git a/ash/system/drive/tray_drive.h b/ash/system/drive/tray_drive.h
new file mode 100644
index 0000000000000000000000000000000000000000..10ceb0b75d44fd149fda631058f205cbb74ae5a1
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+++ b/ash/system/drive/tray_drive.h
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+// 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_TRAY_DRIVE_H_
+#define ASH_SYSTEM_DRIVE_TRAY_DRIVE_H_
+#pragma once
+
+#include "ash/system/drive/drive_observer.h"
+#include "ash/system/tray/tray_image_item.h"
+#include "base/memory/scoped_ptr.h"
+
+
+namespace views {
+class Label;
+}
+
+namespace ash {
+
+namespace internal {
+
+namespace tray {
+class DriveTrayView;
+class DriveDefaultView;
+class DriveDetailedView;
+}
+
+class TrayDrive : public TrayImageItem,
+                  public DriveObserver {
+ public:
+  TrayDrive();
+  virtual ~TrayDrive();
+
+ private:
+  // Overridden from TrayImageItem.
+  virtual bool GetInitialVisibility() OVERRIDE;
+
+  // Overridden from SystemTrayItem.
+  virtual views::View* CreateDefaultView(user::LoginStatus status) OVERRIDE;
+  virtual views::View* CreateDetailedView(user::LoginStatus status) OVERRIDE;
+  virtual void DestroyDefaultView() OVERRIDE;
+  virtual void DestroyDetailedView() OVERRIDE;
+  virtual void UpdateAfterLoginStatusChange(user::LoginStatus status) OVERRIDE;
+
+  // Overridden from DriveObserver.
+  virtual void OnDriveRefresh(const DriveOperationStatusList& list) OVERRIDE;
+
+  // Delayed re-check of the status after encounter operation depleted list.
+  void OnStatusCheck();
+
+  void UpdateTrayIcon(bool show);
+
+  tray::DriveDefaultView* default_;
+  tray::DriveDetailedView* detailed_;
+
+  DISALLOW_COPY_AND_ASSIGN(TrayDrive);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_DRIVE_TRAY_DRIVE_H_