Stop notification updates from unpausing toast timers.

ui/message_center/popup_timer.h

 // Copyright (c) 2013 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 UI_MESSAGE_CENTER_POPUP_TIMER_H_
 #define UI_MESSAGE_CENTER_POPUP_TIMER_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 23 matching lines @@
   ~PopupTimer();
 
   // Starts running the timer.  Barring a Pause or Reset call, the timer will
   // call back to |delegate| after |timeout| seconds.
   void Start();
 
   // Stops the timer, and retains the amount of time that has passed so that on
   // subsequent calls to Start the timer will continue where it left off.
   void Pause();
 
+  // Returns whether the underlying timer is running or not.
+  bool IsRunning() { return timer_->IsRunning(); }
+
  private:
   // Notification ID for which this timer applies.
   const std::string id_;
 
   // Total time that should pass while active before calling TimerFinished.
   base::TimeDelta timeout_;
 
   // If paused, the amount of time that passed before pause.
   base::TimeDelta passed_;
 
   // The time that the timer was last started.
   base::Time start_time_;
 
   // Callback recipient.
   base::WeakPtr<Delegate> timer_delegate_;
 
   // The actual timer.
   std::unique_ptr<base::OneShotTimer> timer_;
 
   DISALLOW_COPY_AND_ASSIGN(PopupTimer);
 };
 
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_POPUP_TIMER_H_