Implement a Hit Test Cache.

Source/core/layout/svg/LayoutSVGRoot.cpp

Index: Source/core/layout/svg/LayoutSVGRoot.cpp
diff --git a/Source/core/layout/svg/LayoutSVGRoot.cpp b/Source/core/layout/svg/LayoutSVGRoot.cpp
index e2f0277b019095c13e0cd549e3b3cb3869c2ed96..8413cee836aea3b1157456b33351c88a3346f30a 100644
--- a/Source/core/layout/svg/LayoutSVGRoot.cpp
+++ b/Source/core/layout/svg/LayoutSVGRoot.cpp
@@ -396,7 +396,7 @@ bool LayoutSVGRoot::nodeAtPoint(HitTestResult& result, const HitTestLocation& lo
             for (LayoutObject* child = lastChild(); child; child = child->previousSibling()) {
                 // FIXME: nodeAtFloatPoint() doesn't handle rect-based hit tests yet.
                 if (child->nodeAtFloatPoint(result, localPoint, hitTestAction)) {
-                    updateHitTestResult(result, pointInBorderBox);
+                    updateHitTestResult(result, pointInBorderBox, boundingRect(locationInContainer.point()));
                     if (!result.addNodeToListBasedTestResult(child->node(), locationInContainer))
                         return true;
                 }
@@ -412,7 +412,7 @@ bool LayoutSVGRoot::nodeAtPoint(HitTestResult& result, const HitTestLocation& lo
         // If we'd return true here in the 'Foreground' phase, we are not able to detect these hits anymore.
         LayoutRect boundsRect(accumulatedOffset + location(), size());
         if (locationInContainer.intersects(boundsRect)) {
-            updateHitTestResult(result, pointInBorderBox);
+            updateHitTestResult(result, pointInBorderBox, boundsRect);
             if (!result.addNodeToListBasedTestResult(node(), locationInContainer, boundsRect))
                 return true;
         }