Handle post-record-time clipPath scaling

bug:29547149

Change-Id: I268210b240d2d8e08638114715f9622840fc02f7
diff --git a/libs/hwui/ClipArea.h b/libs/hwui/ClipArea.h
index 6eb2eef..53d9d03 100644
--- a/libs/hwui/ClipArea.h
+++ b/libs/hwui/ClipArea.h
@@ -179,6 +179,8 @@
             const ClipBase* recordedClip, const Matrix4& recordedClipTransform);
     void applyClip(const ClipBase* recordedClip, const Matrix4& recordedClipTransform);
 
+    static void applyTransformToRegion(const Matrix4& transform, SkRegion* region);
+
 private:
     void enterRectangleMode();
     void rectangleModeClipRectWithTransform(const Rect& r, const mat4* transform, SkRegion::Op op);