Trace where timers were scheduled in Blink

Source/core/html/MediaController.cpp

Index: Source/core/html/MediaController.cpp
diff --git a/Source/core/html/MediaController.cpp b/Source/core/html/MediaController.cpp
index f593f39070a627d6ffd34e2588cbc1dcac805bf0..c7fb6b5feca4024b980b0f4ecac9596ed106f65c 100644
--- a/Source/core/html/MediaController.cpp
+++ b/Source/core/html/MediaController.cpp
@@ -153,7 +153,7 @@ double MediaController::currentTime() const
     if (m_position == MediaPlayer::invalidTime()) {
         // Some clocks may return times outside the range of [0..duration].
         m_position = max(0.0, min(duration(), m_clock->currentTime()));
-        m_clearPositionTimer.startOneShot(0);
+        m_clearPositionTimer.startOneShot(0, FROM_HERE);
     }
 
     return m_position;
@@ -539,7 +539,7 @@ void MediaController::scheduleEvent(const AtomicString& eventName)
 {
     m_pendingEvents.append(Event::createCancelable(eventName));
     if (!m_asyncEventTimer.isActive())
-        m_asyncEventTimer.startOneShot(0);
+        m_asyncEventTimer.startOneShot(0, FROM_HERE);
 }
 
 void MediaController::asyncEventTimerFired(Timer<MediaController>*)
@@ -633,7 +633,7 @@ void MediaController::startTimeupdateTimer()
     if (m_timeupdateTimer.isActive())
         return;
 
-    m_timeupdateTimer.startRepeating(maxTimeupdateEventFrequency);
+    m_timeupdateTimer.startRepeating(maxTimeupdateEventFrequency, FROM_HERE);
 }
 
 void MediaController::timeupdateTimerFired(Timer<MediaController>*)