Use intersection observer to control frame throttling

third_party/WebKit/Source/core/layout/svg/SVGLayoutSupport.h

 /**
  * Copyright (C) 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.  All rights reserved.
  * 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
@@ skipping 93 matching lines @@
       const LayoutBoxModelObject* ancestor,
       const FloatRect& localPaintInvalidationRect,
       LayoutRect& resultRect,
       VisualRectFlags = DefaultVisualRectFlags);
   static void mapLocalToAncestor(const LayoutObject*,
                                  const LayoutBoxModelObject* ancestor,
                                  TransformState&,
                                  MapCoordinatesFlags);
   static void mapAncestorToLocal(const LayoutObject&,
                                  const LayoutBoxModelObject* ancestor,
-                                 TransformState&);
+                                 TransformState&,
+                                 MapCoordinatesFlags);
   static const LayoutObject* pushMappingToContainer(
       const LayoutObject*,
       const LayoutBoxModelObject* ancestorToStopAt,
       LayoutGeometryMap&);
 
   // Shared between SVG layoutObjects and resources.
   static void applyStrokeStyleToStrokeData(StrokeData&,
                                            const ComputedStyle&,
                                            const LayoutObject&,
                                            float dashScaleFactor);
@@ skipping 97 matching lines @@
     if (child->hasNonIsolatedBlendingDescendants() &&
         !willIsolateBlendingDescendantsForObject(child))
       return true;
   }
   return false;
 }
 
 }  // namespace blink
 
 #endif  // SVGLayoutSupport_h