Implement a Hit Test Cache.

Source/core/layout/svg/LayoutSVGShape.cpp

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2008 Rob Buis <buis@kde.org>
  * Copyright (C) 2005, 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  * Copyright (C) 2009 Jeff Schiller <codedread@gmail.com>
  * Copyright (C) 2011 Renata Hodovan <reni@webkit.org>
  * Copyright (C) 2011 University of Szeged
@@ skipping 203 matching lines @@
     // We only draw in the foreground phase, so we only hit-test then.
     if (hitTestAction != HitTestForeground)
         return false;
 
     FloatPoint localPoint;
     if (!SVGLayoutSupport::transformToUserSpaceAndCheckClipping(this, localToParentTransform(), pointInParent, localPoint))
         return false;
 
     PointerEventsHitRules hitRules(PointerEventsHitRules::SVG_GEOMETRY_HITTESTING, result.hitTestRequest(), style()->pointerEvents());
     if (nodeAtFloatPointInternal(result.hitTestRequest(), localPoint, hitRules)) {
-        updateHitTestResult(result, roundedLayoutPoint(localPoint));
+        updateHitTestResult(result, roundedLayoutPoint(localPoint), boundingRect(result.hitTestLocation().point()));
         return true;
     }
 
     return false;
 }
 
 bool LayoutSVGShape::nodeAtFloatPointInternal(const HitTestRequest& request, const FloatPoint& localPoint, PointerEventsHitRules hitRules)
 {
     bool isVisible = (style()->visibility() == VISIBLE);
     if (isVisible || !hitRules.requireVisible) {
@@ skipping 46 matching lines @@
     SVGLayoutSupport::intersectPaintInvalidationRectWithResources(this, m_paintInvalidationBoundingBox);
 }
 
 float LayoutSVGShape::strokeWidth() const
 {
     SVGLengthContext lengthContext(element());
     return lengthContext.valueForLength(style()->svgStyle().strokeWidth());
 }
 
 }