[SVG] Reject hit-test queries when the element has a singular transform

Source/core/rendering/svg/SVGRenderSupport.h

Index: Source/core/rendering/svg/SVGRenderSupport.h
diff --git a/Source/core/rendering/svg/SVGRenderSupport.h b/Source/core/rendering/svg/SVGRenderSupport.h
index 32accba3a3af4223e5aecc54a7894b40f7a3c26e..e7caabeaa967182472b1e8306de93dfa0765fdc9 100644
--- a/Source/core/rendering/svg/SVGRenderSupport.h
+++ b/Source/core/rendering/svg/SVGRenderSupport.h
@@ -61,6 +61,11 @@ public:
     // Determines whether the passed point lies in a clipping area
     static bool pointInClippingArea(RenderObject*, const FloatPoint&);
 
+    // Transform |pointInParent| to |object|'s user-space and check if it is
+    // within the clipping area. Returns false if the transform is singular or
+    // the point is outside the clipping area.
+    static bool transformToUserSpaceAndCheckClipping(RenderObject*, const AffineTransform& localTransform, const FloatPoint& pointInParent, FloatPoint& localPoint);
+
     static void computeContainerBoundingBoxes(const RenderObject* container, FloatRect& objectBoundingBox, bool& objectBoundingBoxValid, FloatRect& strokeBoundingBox, FloatRect& repaintBoundingBox);
 
     static bool paintInfoIntersectsRepaintRect(const FloatRect& localRepaintRect, const AffineTransform& localTransform, const PaintInfo&);