Implement a Hit Test Cache.

Source/core/layout/HitTestLocation.cpp

Index: Source/core/layout/HitTestLocation.cpp
diff --git a/Source/core/layout/HitTestLocation.cpp b/Source/core/layout/HitTestLocation.cpp
index fd37f2de430119602396189090ad599dcfc75ad1..65e66e13cc454d8723f4b37eb3e4a6f73b994fc1 100644
--- a/Source/core/layout/HitTestLocation.cpp
+++ b/Source/core/layout/HitTestLocation.cpp
@@ -122,7 +122,6 @@ bool HitTestLocation::intersectsRect(const RectType& rect, const RectType& bound
 {
     // FIXME: When the hit test is not rect based we should use rect.contains(m_point).
     // That does change some corner case tests though.
-
     // First check if rect even intersects our bounding box.
     if (!rect.intersects(boundingBox))
         return false;
@@ -141,11 +140,17 @@ bool HitTestLocation::intersectsRect(const RectType& rect, const RectType& bound
 
 bool HitTestLocation::intersects(const LayoutRect& rect) const
 {
+    if (!m_isRectBased)
+        return rect.contains(m_point);
+
     return intersectsRect(rect, LayoutRect(m_boundingBox));
 }
 
 bool HitTestLocation::intersects(const FloatRect& rect) const
 {
+    if (!m_isRectBased)
+        return rect.contains(FloatPoint(m_point));
+
     return intersectsRect(rect, FloatRect(m_boundingBox));
 }