NOT FOR COMMIT: sample CL to debug white flashes.

third_party/WebKit/Source/web/ChromeClientImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 919 matching lines @@
             m_webView->hasTouchEventHandlers(properties != WebEventListenerProperties::Nothing || eventListenerProperties(WebEventListenerClass::TouchStartOrMove) != WebEventListenerProperties::Nothing);
         }
     } else {
         m_webView->hasTouchEventHandlers(true);
     }
 }
 
 void ChromeClientImpl::beginLifecycleUpdates()
 {
     if (WebLayerTreeView* treeView = m_webView->layerTreeView()) {
+        LOG(ERROR) << "Start painting";
         treeView->setDeferCommits(false);
         treeView->setNeedsBeginFrame();
     }
 }
 
 WebEventListenerProperties ChromeClientImpl::eventListenerProperties(WebEventListenerClass eventClass) const
 {
     if (WebLayerTreeView* treeView = m_webView->layerTreeView())
         return treeView->eventListenerProperties(eventClass);
     return WebEventListenerProperties::Nothing;
@@ skipping 168 matching lines @@
 {
     return adoptPtr(m_webView->scheduler()->createFrameScheduler(blameContext).release());
 }
 
 double ChromeClientImpl::lastFrameTimeMonotonic() const
 {
     return m_webView->lastFrameTimeMonotonic();
 }
 
 } // namespace blink