Add createSized2D to C++ API

Change-Id: Idee31c74ba93cae334473a43a045e18c34a3fc31
diff --git a/cpp/rsCppStructs.h b/cpp/rsCppStructs.h
index b2b6d36..888837f 100644
--- a/cpp/rsCppStructs.h
+++ b/cpp/rsCppStructs.h
@@ -254,6 +254,10 @@
                                    uint32_t usage = RS_ALLOCATION_USAGE_SCRIPT);
     static sp<Allocation> createSized(sp<RS> rs, sp<const Element> e, size_t count,
                                    uint32_t usage = RS_ALLOCATION_USAGE_SCRIPT);
+    static sp<Allocation> createSized2D(sp<RS> rs, sp<const Element> e,
+                                        size_t x, size_t y,
+                                        uint32_t usage = RS_ALLOCATION_USAGE_SCRIPT);
+
 
 };