Make RootScroller set the outer viewport scroll layer in the compositor

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 1060 matching lines @@
 {
     if (m_webView->rootGraphicsLayer() && m_webView->layerTreeView())
         m_webView->page()->frameHost().visualViewport().registerLayersWithTreeView(m_webView->layerTreeView());
 }
 
 void ChromeClientImpl::didUpdateTopControls() const
 {
     m_webView->didUpdateTopControls();
 }
 
+void ChromeClientImpl::didUpdateRootScrollerLayer(WebLayer* rootScrollerLayer) const
+{
+    m_webView->didUpdateRootScrollerLayer(rootScrollerLayer);
+}
+
 CompositorProxyClient* ChromeClientImpl::createCompositorProxyClient(LocalFrame* frame)
 {
     WebLocalFrameImpl* webFrame = WebLocalFrameImpl::fromFrame(frame);
     return webFrame->localRoot()->frameWidget()->createCompositorProxyClient();
 }
 
 void ChromeClientImpl::registerPopupOpeningObserver(PopupOpeningObserver* observer)
 {
     DCHECK(observer);
     m_popupOpeningObservers.append(observer);
@@ skipping 28 matching lines @@
 {
     return wrapUnique(m_webView->scheduler()->createFrameScheduler(blameContext).release());
 }
 
 double ChromeClientImpl::lastFrameTimeMonotonic() const
 {
     return m_webView->lastFrameTimeMonotonic();
 }
 
 } // namespace blink