Remove CompositingUpdateOnScroll

Source/core/rendering/RenderLayerScrollableArea.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 1473 matching lines @@
 void RenderLayerScrollableArea::updateCompositingLayersAfterScroll()
 {
     RenderLayerCompositor* compositor = box().view()->compositor();
     if (compositor->inCompositingMode()) {
         if (usesCompositedScrolling()) {
             DisableCompositingQueryAsserts disabler;
             ASSERT(box().hasCompositedLayerMapping());
             box().compositedLayerMapping()->setNeedsGraphicsLayerUpdate();
             compositor->setNeedsCompositingUpdate(CompositingUpdateOnCompositedScroll);
         } else {
-            compositor->setNeedsCompositingUpdate(CompositingUpdateOnScroll);
+            layer()->setNeedsToUpdateAncestorDependentProperties();
+            compositor->setNeedsCompositingUpdate(CompositingUpdateAfterCompositingInputChange);
         }
     }
 }
 
 bool RenderLayerScrollableArea::usesCompositedScrolling() const
 {
     // Scroll form controls on the main thread so they exhibit correct touch scroll event bubbling
     if (box().isIntristicallyScrollable(VerticalScrollbar) || box().isIntristicallyScrollable(HorizontalScrollbar))
         return false;
 
     // See https://codereview.chromium.org/176633003/ for the tests that fail without this disabler.
     DisableCompositingQueryAsserts disabler;
     return box().hasCompositedLayerMapping() && box().compositedLayerMapping()->scrollingLayer();
 }
 
 bool RenderLayerScrollableArea::needsCompositedScrolling() const
 {
     return scrollsOverflow() && box().view()->compositor()->acceleratedCompositingForOverflowScrollEnabled();
 }
 
 } // Namespace WebCore