Implement a Hit Test Cache.

Source/core/layout/svg/LayoutSVGContainer.cpp

Index: Source/core/layout/svg/LayoutSVGContainer.cpp
diff --git a/Source/core/layout/svg/LayoutSVGContainer.cpp b/Source/core/layout/svg/LayoutSVGContainer.cpp
index 6f7b88eeb13636eb3abac0af295db2bdab769ed9..68e1fbcb327b81c83e6f369d7de07cc3637d15c1 100644
--- a/Source/core/layout/svg/LayoutSVGContainer.cpp
+++ b/Source/core/layout/svg/LayoutSVGContainer.cpp
@@ -24,6 +24,7 @@
 #include "config.h"
 #include "core/layout/svg/LayoutSVGContainer.h"
 
+#include "core/layout/HitTestResult.h"
 #include "core/layout/LayoutAnalyzer.h"
 #include "core/layout/svg/SVGLayoutSupport.h"
 #include "core/layout/svg/SVGResources.h"
@@ -174,7 +175,8 @@ bool LayoutSVGContainer::nodeAtFloatPoint(HitTestResult& result, const FloatPoin
 
     for (LayoutObject* child = lastChild(); child; child = child->previousSibling()) {
         if (child->nodeAtFloatPoint(result, localPoint, hitTestAction)) {
-            updateHitTestResult(result, roundedLayoutPoint(localPoint));
+            updateHitTestResult(result, roundedLayoutPoint(localPoint),
+                boundingRect(result.hitTestLocation().point()));
             return true;
         }
     }
@@ -183,7 +185,8 @@ bool LayoutSVGContainer::nodeAtFloatPoint(HitTestResult& result, const FloatPoin
     if (style()->pointerEvents() == PE_BOUNDINGBOX) {
         ASSERT(isObjectBoundingBoxValid());
         if (objectBoundingBox().contains(localPoint)) {
-            updateHitTestResult(result, roundedLayoutPoint(localPoint));
+            updateHitTestResult(result, roundedLayoutPoint(localPoint),
+                boundingRect(result.hitTestLocation().point()));
             return true;
         }
     }