CC AnimationHost: Fix ProgrammaticScrollAnimator detach scope.

third_party/WebKit/Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 2667 matching lines @@
     return m_rootLayer;
 }
 
 void WebViewImpl::willCloseLayerTreeView()
 {
     if (m_linkHighlightsTimeline) {
         detachCompositorAnimationTimeline(m_linkHighlightsTimeline.get());
         m_linkHighlightsTimeline.clear();
     }
 
+    if (page())
+        page()->willCloseLayerTreeView();
+
     setRootGraphicsLayer(nullptr);
     m_layerTreeView = nullptr;
 }
 
 void WebViewImpl::didAcquirePointerLock()
 {
     if (page())
         page()->pointerLockController().didAcquirePointerLock();
 }
 
@@ skipping 1765 matching lines @@
     if (m_pageColorOverlay)
         m_pageColorOverlay->update();
     if (InspectorOverlay* overlay = inspectorOverlay()) {
         PageOverlay* inspectorPageOverlay = overlay->pageOverlay();
         if (inspectorPageOverlay)
             inspectorPageOverlay->update();
     }
 }
 
 } // namespace blink