Add RGBA_5551.

Change-Id: Ie9e465300bcb2985df79cf884ce7209ff41570c9
diff --git a/cpp/Element.cpp b/cpp/Element.cpp
index d3fb29a..97a600e 100644
--- a/cpp/Element.cpp
+++ b/cpp/Element.cpp
@@ -112,6 +112,7 @@
 CREATE_PIXEL(RGBA_4444, UNSIGNED_4_4_4_4, PIXEL_RGBA);
 CREATE_PIXEL(RGBA_8888, UNSIGNED_8, PIXEL_RGBA);
 CREATE_PIXEL(YUV, UNSIGNED_8, PIXEL_YUV);
+CREATE_PIXEL(RGBA_5551, UNSIGNED_5_5_5_1, PIXEL_RGBA);
 
 #define CREATE_VECTOR(N, T) android::RSC::sp<const Element> Element::N##_2(android::RSC::sp<RS> rs) { \
     if (rs->mElements.N##_2 == NULL) {                                  \