Include transform origin in the transform tree.

Source/platform/geometry/FloatPoint3D.h

Index: Source/platform/geometry/FloatPoint3D.h
diff --git a/Source/platform/geometry/FloatPoint3D.h b/Source/platform/geometry/FloatPoint3D.h
index d32ce299c4a323cd65a4fda529500c552566e3e4..b6d7579139cec21f21fdbbe4082b05b5a79d7ece 100644
--- a/Source/platform/geometry/FloatPoint3D.h
+++ b/Source/platform/geometry/FloatPoint3D.h
@@ -24,6 +24,7 @@
 #define FloatPoint3D_h
 
 #include "platform/geometry/FloatPoint.h"
+#include "third_party/skia/include/core/SkPoint3.h"
 
 namespace blink {
 
@@ -127,6 +128,8 @@ public:
 
     float distanceTo(const FloatPoint3D& a) const;
 
+    operator SkPoint3() const { return SkPoint3::Make(m_x, m_y, m_z); }
+
 private:
     float m_x;
     float m_y;