Add WebNotificationTray to the status area

ash/system/tray/system_tray.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_H_
 #define ASH_SYSTEM_TRAY_SYSTEM_TRAY_H_
 #pragma once
 
 #include "ash/ash_export.h"
 #include "ash/system/power/power_supply_status.h"
@@ skipping 78 matching lines @@
 
   // Hides the notification view for |item|.
   void HideNotificationView(SystemTrayItem* item);
 
   // Updates the items when the login status of the system changes.
   void UpdateAfterLoginStatusChange(user::LoginStatus login_status);
 
   // Updates the items when the shelf alignment changes.
   void UpdateAfterShelfAlignmentChange(ShelfAlignment alignment);
 
+  // Temporarily hides/unhides the notification bubble.
+  void SetHideNotifications(bool hidden);
+
+  // Returns true if the primary bubble is visible.
+  bool IsBubbleVisible() const;
+
   // Returns true if the launcher should show.
   bool should_show_launcher() const {
     return bubble_.get() && should_show_launcher_;
   }
 
   AccessibilityObserver* accessibility_observer() const {
     return accessibility_observer_;
   }
   AudioObserver* audio_observer() const {
     return audio_observer_;
@@ skipping 125 matching lines @@
   // See description agove getter.
   bool should_show_launcher_;
 
   scoped_ptr<internal::SystemTrayLayerAnimationObserver>
       layer_animation_observer_;
 
   // Keep track of the default view height so that when we create detailed
   // views directly (e.g. from a notification) we know what height to use.
   int default_bubble_height_;
 
+  // Set to true when system notifications should be hidden (e.g. web
+  // notification bubble is visible).
+  bool hide_notifications_;
+
   DISALLOW_COPY_AND_ASSIGN(SystemTray);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_H_