Draw n-patches using OpenGL.

Currently only tested with title bars and buttons.

Change-Id: I8263a9281898dc0e943b1b8412827fe55639b9d6
diff --git a/libs/hwui/Android.mk b/libs/hwui/Android.mk
index 9146ba6..2d6263d 100644
--- a/libs/hwui/Android.mk
+++ b/libs/hwui/Android.mk
@@ -5,6 +5,7 @@
 	LayerCache.cpp \
 	Matrix.cpp \
 	OpenGLRenderer.cpp \
+	PatchCache.cpp \
 	Program.cpp \
 	TextureCache.cpp