Enable universal accelerated overflow scroll

Source/core/testing/Internals.idl

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 160 matching lines @@
 
     // Flags for layerTreeAsText.
     // The values of these constants must be kept in sync with the values of LayerTreeAsTextBehaviorFlags in GraphicsLayerClient.h.
     const unsigned short LAYER_TREE_INCLUDES_REPAINT_RECTS = 2;
     const unsigned short LAYER_TREE_INCLUDES_PAINTING_PHASES = 4;
     const unsigned short LAYER_TREE_INCLUDES_ROOT_LAYER = 8;
     const unsigned short LAYER_TREE_INCLUDES_CLIP_AND_SCROLL_PARENTS = 16;
     [RaisesException] DOMString layerTreeAsText(Document document, optional unsigned short flags);
     [RaisesException] DOMString elementLayerTreeAsText(Element element, optional unsigned short flags);
 
-    [RaisesException] NodeList paintOrderListBeforePromote(Element element);
-    [RaisesException] NodeList paintOrderListAfterPromote(Element element);
-
     [RaisesException] boolean scrollsWithRespectTo(Element element1, Element element2);
     [RaisesException] boolean isUnclippedDescendant(Element element);
-    [RaisesException] boolean needsCompositedScrolling(Element element);
 
     // The values of these constants must be kept in sync with those in RenderLayer.
     const unsigned short DO_NOT_FORCE_COMPOSITED_SCROLLING = 0;
     const unsigned short COMPOSITED_SCROLLING_ALWAYS_ON = 1;
     const unsigned short COMPOSITED_SCROLLING_ALWAYS_OFF = 2;
     [RaisesException] void setNeedsCompositedScrolling(Element element, unsigned short value);
 
     [RaisesException] DOMString scrollingStateTreeAsText(Document document);
     [RaisesException] DOMString mainThreadScrollingReasons(Document document);
     [RaisesException] ClientRectList nonFastScrollableRects(Document document);
@@ skipping 84 matching lines @@
     [CallWith=ExecutionContext] Promise createPromise();
     [CallWith=ExecutionContext] Promise createResolvedPromise(any value);
     [CallWith=ExecutionContext] Promise createRejectedPromise(any reason);
     [CallWith=ExecutionContext] Promise addOneToPromise(Promise promise);
 
     void startSpeechInput(Element element);
     void setValueForUser(Element element, DOMString value);
 
     DOMString textSurroundingNode(Node node, long x, long y, unsigned long maxLength);
 };