Add deprecation message for -webkit-background-composite

third_party/WebKit/Source/core/page/Page.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All Rights Reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 480 matching lines @@
             view->updateAcceleratedCompositingSettings();
     }
 }
 
 void Page::didCommitLoad(LocalFrame* frame)
 {
     notifyDidCommitLoad(frame);
     if (m_mainFrame == frame) {
         frame->console().clearMessages();
         useCounter().didCommitLoad();
+        deprecation().clearSuppression();

[nainar, 2016/02/01 07:37:03]

Addition: Clearing all suppression bits here.

         frameHost().visualViewport().sendUMAMetrics();
         m_originsUsingFeatures.updateMeasurementsAndClear();
         UserGestureIndicator::clearProcessedUserGestureSinceLoad();
     }
 }
 
 void Page::acceptLanguagesChanged()
 {
     WillBeHeapVector<RefPtrWillBeMember<LocalFrame>> frames;
 
@@ skipping 96 matching lines @@
 {
 }
 
 Page::PageClients::~PageClients()
 {
 }
 
 template class CORE_TEMPLATE_EXPORT WillBeHeapSupplement<Page>;
 
 } // namespace blink