DelayTimer destruction test

base/timer.h

 // Copyright (c) 2006-2008 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.
 
 // OneShotTimer and RepeatingTimer provide a simple timer API.  As the names
 // suggest, OneShotTimer calls you back once after a time delay expires.
 // RepeatingTimer on the other hand calls you back periodically with the
 // prescribed time interval.
 //
 // OneShotTimer and RepeatingTimer both cancel the timer when they go out of
@@ skipping 188 matching lines @@
 class RepeatingTimer : public BaseTimer<Receiver, true> {};
 
 //-----------------------------------------------------------------------------
 // A Delay timer is like The Button from Lost. Once started, you have to keep
 // calling Reset otherwise it will call the given method in the MessageLoop
 // thread.
 //
 // Once created, it is inactive until Reset is called. Once |delay| seconds have
 // passed since the last call to Reset, the callback is made. Once the callback
 // has been made, it's inactive until Reset is called again.
+//
+// If destroyed, the timeout is canceled and will not occur even if already
+// inflight.
 template <class Receiver>
 class DelayTimer {
  public:
   typedef void (Receiver::*ReceiverMethod)();
 
   DelayTimer(TimeDelta delay, Receiver* receiver, ReceiverMethod method)
       : receiver_(receiver),
         method_(method),
         delay_(delay) {
   }
@@ skipping 34 matching lines @@
   const ReceiverMethod method_;
   const TimeDelta delay_;
 
   OneShotTimer<DelayTimer<Receiver> > timer_;
   Time trigger_time_;
 };
 
 }  // namespace base
 
 #endif  // BASE_TIMER_H_