Trace where timers were scheduled in Blink

Source/web/ValidationMessageClientImpl.cpp

 /*
  * Copyright (C) 2012 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
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 74 matching lines @@
     WebTextDirection dir = m_currentAnchor->renderer()->style()->direction() == RTL ? WebTextDirectionRightToLeft : WebTextDirectionLeftToRight;
     AtomicString title = m_currentAnchor->fastGetAttribute(HTMLNames::titleAttr);
     m_webView.client()->showValidationMessage(anchorInRootView, m_message, title, dir);
 
     const double minimumSecondToShowValidationMessage = 5.0;
     const double secondPerCharacter = 0.05;
     const double statusCheckInterval = 0.1;
     m_finishTime = monotonicallyIncreasingTime() + std::max(minimumSecondToShowValidationMessage, (message.length() + title.length()) * secondPerCharacter);
     // FIXME: We should invoke checkAnchorStatus actively when layout, scroll,
     // or page scale change happen.
-    m_timer.startRepeating(statusCheckInterval);
+    m_timer.startRepeating(statusCheckInterval, FROM_HERE);
 }
 
 void ValidationMessageClientImpl::hideValidationMessage(const Element& anchor)
 {
     if (!m_currentAnchor || !isValidationMessageVisible(anchor))
         return;
     m_timer.stop();
     m_currentAnchor = 0;
     m_message = String();
     m_finishTime = 0;
@@ skipping 30 matching lines @@
 
     IntRect newAnchorRectInScreen = currentView()->hostWindow()->rootViewToScreen(newAnchorRect);
     if (newAnchorRectInScreen == m_lastAnchorRectInScreen && m_webView.pageScaleFactor() == m_lastPageScaleFactor)
         return;
     m_lastAnchorRectInScreen = newAnchorRectInScreen;
     m_lastPageScaleFactor = m_webView.pageScaleFactor();
     m_webView.client()->moveValidationMessage(newAnchorRect);
 }
 
 }