Use intersection observer to control frame throttling

third_party/WebKit/Source/core/layout/svg/LayoutSVGBlock.cpp

 /*
  * Copyright (C) 2006 Apple Computer, Inc.
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 79 matching lines @@
 }
 
 void LayoutSVGBlock::mapLocalToAncestor(const LayoutBoxModelObject* ancestor,
                                         TransformState& transformState,
                                         MapCoordinatesFlags flags) const {
   SVGLayoutSupport::mapLocalToAncestor(this, ancestor, transformState, flags);
 }
 
 void LayoutSVGBlock::mapAncestorToLocal(const LayoutBoxModelObject* ancestor,
                                         TransformState& transformState,
-                                        MapCoordinatesFlags) const {
+                                        MapCoordinatesFlags flags) const {
   if (this == ancestor)
     return;
-  SVGLayoutSupport::mapAncestorToLocal(*this, ancestor, transformState);
+  SVGLayoutSupport::mapAncestorToLocal(*this, ancestor, transformState, flags);
 }
 
 const LayoutObject* LayoutSVGBlock::pushMappingToContainer(
     const LayoutBoxModelObject* ancestorToStopAt,
     LayoutGeometryMap& geometryMap) const {
   return SVGLayoutSupport::pushMappingToContainer(this, ancestorToStopAt,
                                                   geometryMap);
 }
 
 LayoutRect LayoutSVGBlock::absoluteClippedOverflowRect() const {
@@ skipping 11 matching lines @@
 
 bool LayoutSVGBlock::nodeAtPoint(HitTestResult&,
                                  const HitTestLocation&,
                                  const LayoutPoint&,
                                  HitTestAction) {
   ASSERT_NOT_REACHED();
   return false;
 }
 
 }  // namespace blink