Trace where timers were scheduled in Blink

Source/platform/Timer.h

 /*
  * Copyright (C) 2006 Apple Computer, 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
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef Timer_h
 #define Timer_h
 
 #include "platform/PlatformExport.h"
+#include "platform/TraceLocation.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/Threading.h"
 #include "wtf/Vector.h"
 
 namespace WebCore {
 
 // Time intervals are all in seconds.
 
 class TimerHeapElement;
 
 class PLATFORM_EXPORT TimerBase {
     WTF_MAKE_NONCOPYABLE(TimerBase); WTF_MAKE_FAST_ALLOCATED;
 public:
     TimerBase();
     virtual ~TimerBase();
 
-    void start(double nextFireInterval, double repeatInterval);
+    void start(double nextFireInterval, double repeatInterval, const TraceLocation&);
 
-    void startRepeating(double repeatInterval) { start(repeatInterval, repeatInterval); }
-    void startOneShot(double interval) { start(interval, 0); }
+    void startRepeating(double repeatInterval, const TraceLocation& caller)
+    {
+        start(repeatInterval, repeatInterval, caller);
+    }
+    void startOneShot(double interval, const TraceLocation& caller)
+    {
+        start(interval, 0, caller);
+    }
 
     void stop();
     bool isActive() const;
+    const TraceLocation& location() const { return m_location; }
 
     double nextFireInterval() const;
     double nextUnalignedFireInterval() const;
     double repeatInterval() const { return m_repeatInterval; }
 
     void augmentRepeatInterval(double delta) {
         setNextFireTime(m_nextFireTime + delta);
         m_repeatInterval += delta;
     }
 
@@ skipping 25 matching lines @@
     void heapPopMin();
 
     Vector<TimerBase*>& timerHeap() const { ASSERT(m_cachedThreadGlobalTimerHeap); return *m_cachedThreadGlobalTimerHeap; }
 
     double m_nextFireTime; // 0 if inactive
     double m_unalignedNextFireTime; // m_nextFireTime not considering alignment interval
     double m_repeatInterval; // 0 if not repeating
     int m_heapIndex; // -1 if not in heap
     unsigned m_heapInsertionOrder; // Used to keep order among equal-fire-time timers
     Vector<TimerBase*>* m_cachedThreadGlobalTimerHeap;
+    TraceLocation m_location;
 
 #ifndef NDEBUG
     ThreadIdentifier m_thread;
 #endif
 
     friend class ThreadTimers;
     friend class TimerHeapLessThanFunction;
     friend class TimerHeapReference;
 };
 
@@ skipping 24 matching lines @@
     typedef void (TimerFiredClass::*TimerFiredFunction)(DeferrableOneShotTimer*);
 
     DeferrableOneShotTimer(TimerFiredClass* o, TimerFiredFunction f, double delay)
         : m_object(o)
         , m_function(f)
         , m_delay(delay)
         , m_shouldRestartWhenTimerFires(false)
     {
     }
 
-    void restart()
+    void restart(const TraceLocation& caller)
     {
         // Setting this boolean is much more efficient than calling startOneShot
         // again, which might result in rescheduling the system timer which
         // can be quite expensive.
 
         if (isActive()) {
             m_shouldRestartWhenTimerFires = true;
             return;
         }
-        startOneShot(m_delay);
+        startOneShot(m_delay, caller);
     }
 
     using TimerBase::stop;
     using TimerBase::isActive;
 
 private:
     virtual void fired() OVERRIDE
     {
         if (m_shouldRestartWhenTimerFires) {
             m_shouldRestartWhenTimerFires = false;
-            startOneShot(m_delay);
+            // FIXME: This should not be FROM_HERE.
+            startOneShot(m_delay, FROM_HERE);
             return;
         }
 
         (m_object->*m_function)(this);
     }
 
     TimerFiredClass* m_object;
     TimerFiredFunction m_function;
 
     double m_delay;
     bool m_shouldRestartWhenTimerFires;
 };
 
 }
 
 #endif