Add localToAbsoluteTransform and localToAncestorTransform.

third_party/WebKit/Source/core/layout/LayoutObject.h

Index: third_party/WebKit/Source/core/layout/LayoutObject.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutObject.h b/third_party/WebKit/Source/core/layout/LayoutObject.h
index 04ae2f672ed363e1122345e6957fbc0b60a72e37..5224cf62a215a189ec5e918b281b3201d7e5de43 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.h
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.h
@@ -986,6 +986,13 @@ public:
     FloatPoint localToAncestorPoint(const FloatPoint&, const LayoutBoxModelObject* ancestor, MapCoordinatesFlags = 0, bool* wasFixed = nullptr, const PaintInvalidationState* = nullptr) const;
     void localToAncestorRects(Vector<LayoutRect>&, const LayoutBoxModelObject* ancestor, const LayoutPoint& preOffset, const LayoutPoint& postOffset) const;
 
+    // Return the transformation matrix to map points from local to the coordinate system of a container, taking transforms into account.
+    TransformationMatrix localToAncestorTransform(const LayoutBoxModelObject* ancestor, MapCoordinatesFlags = 0, bool* wasFixed = nullptr) const;
+    TransformationMatrix localToAbsoluteTransform(MapCoordinatesFlags mode = 0, bool* wasFixed = nullptr) const
+    {
+        return localToAncestorTransform(nullptr, mode, wasFixed);
+    }
+
     // Convert a local point into the coordinate system of backing coordinates. Also returns the backing layer if needed.
     FloatPoint localToInvalidationBackingPoint(const LayoutPoint&, PaintLayer** backingLayer = nullptr);