Antialiasing for rectangles

Change-Id: I7ca6931606541ddd504bd5db7f8dc04b9cde8cd9
diff --git a/libs/hwui/OpenGLRenderer.h b/libs/hwui/OpenGLRenderer.h
index 271e4b1..ffacbfc 100644
--- a/libs/hwui/OpenGLRenderer.h
+++ b/libs/hwui/OpenGLRenderer.h
@@ -285,6 +285,9 @@
 
     void drawAlphaBitmap(Texture* texture, float left, float top, SkPaint* paint);
 
+    void drawAARect(float left, float top, float right, float bottom,
+            int color, SkXfermode::Mode mode);
+
     /**
      * Draws a textured rectangle with the specified texture. The specified coordinates
      * are transformed by the current snapshot's transform matrix.