Make blink::TimerBase own the WebTaskRunner for timer task

third_party/WebKit/Source/platform/Timer.cpp

 /*
  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 26 matching lines @@
 #include <limits.h>
 #include <limits>
 #include <math.h>
 
 namespace blink {
 
 TimerBase::TimerBase(WebTaskRunner* webTaskRunner)
     : m_nextFireTime(0)
     , m_repeatInterval(0)
     , m_cancellableTimerTask(nullptr)
-    , m_webTaskRunner(webTaskRunner)
+    , m_webTaskRunner(webTaskRunner->clone())
 #if DCHECK_IS_ON()
     , m_thread(currentThread())
 #endif
 {
     ASSERT(m_webTaskRunner);
 }
 
 TimerBase::~TimerBase()
 {
     stop();
@@ skipping 35 matching lines @@
 }
 
 // static
 WebTaskRunner* TimerBase::getUnthrottledTaskRunner()
 {
     return Platform::current()->currentThread()->getWebTaskRunner();
 }
 
 WebTaskRunner* TimerBase::timerTaskRunner() const
 {
-    return m_webTaskRunner;
+    return m_webTaskRunner.get();
 }
 
 void TimerBase::setNextFireTime(double now, double delay)
 {
     ASSERT(m_thread == currentThread());
 
     double newTime = now + delay;
 
     if (m_nextFireTime != newTime) {
         m_nextFireTime = newTime;
@@ skipping 38 matching lines @@
     return a->m_nextFireTime < b->m_nextFireTime;
 }
 
 // static
 double TimerBase::timerMonotonicallyIncreasingTime() const
 {
     return timerTaskRunner()->monotonicallyIncreasingVirtualTimeSeconds();
 }
 
 } // namespace blink