OverscrollGlow for mainThread-{BLINK CHANGES}

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 273 matching lines @@
         return;
 
     WebNavigationPolicy policy = static_cast<WebNavigationPolicy>(navigationPolicy);
     if (policy == WebNavigationPolicyIgnore)
         policy = getNavigationPolicy(m_windowFeatures);
     else if (policy == WebNavigationPolicyNewBackgroundTab && getNavigationPolicy(m_windowFeatures) != WebNavigationPolicyNewBackgroundTab)
         policy = WebNavigationPolicyNewForegroundTab;
     m_webView->client()->show(policy);
 }
 
+void ChromeClientImpl::didOverscroll(const FloatSize& unusedDelta, const FloatSize& accumulatedRootOverScroll, const FloatPoint& position, const FloatSize& velocity)
+{
+    if (!m_webView->client())
+        return;
+
+    m_webView->client()->didOverscroll(unusedDelta, accumulatedRootOverScroll, position, velocity);
+}
+
 void ChromeClientImpl::setToolbarsVisible(bool value)
 {
     m_windowFeatures.toolBarVisible = value;
 }
 
 bool ChromeClientImpl::toolbarsVisible()
 {
     return m_windowFeatures.toolBarVisible;
 }
 
@@ skipping 605 matching lines @@
     if (m_webView->rootGraphicsLayer() && m_webView->layerTreeView())
         m_webView->page()->frameHost().pinchViewport().registerLayersWithTreeView(m_webView->layerTreeView());
 }
 
 void ChromeClientImpl::didUpdateTopControls() const
 {
     m_webView->didUpdateTopControls();
 }
 
 } // namespace blink