Add WebNotificationTray to the status area

ash/system/tray/system_tray_bubble.h

 // 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_TRAY_SYSTEM_TRAY_BUBBLE_H_
 #define ASH_SYSTEM_TRAY_SYSTEM_TRAY_BUBBLE_H_
 #pragma once
 
 #include "ash/system/tray/tray_bubble_view.h"
 #include "ash/system/user/login_status.h"
@@ skipping 62 matching lines @@
   virtual void OnMouseExitedView() OVERRIDE;
 
   BubbleType bubble_type() const { return bubble_type_; }
   TrayBubbleView* bubble_view() const { return bubble_view_; }
 
   void DestroyItemViews();
   void StartAutoCloseTimer(int seconds);
   void StopAutoCloseTimer();
   void RestartAutoCloseTimer();
   void Close();
+  void SetVisible(bool is_visible);
+  bool IsVisible();
 
  private:
   void CreateItemViews(user::LoginStatus login_status);
 
   // Closes the bubble if the event happened outside the bounds.
   // Returns true if the event should be stopped from being propagated farther.
   bool ProcessLocatedEvent(const aura::LocatedEvent& event);
 
   // Overridden from aura::EventFilter.
   virtual bool PreHandleKeyEvent(aura::Window* target,
@@ skipping 19 matching lines @@
   int autoclose_delay_;
   base::OneShotTimer<SystemTrayBubble> autoclose_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemTrayBubble);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_BUBBLE_H_