Adding anisotropic filtering and related samples.

Change-Id: Idb173274417feb5e25bfd64c5e9fa2492a23a17e
diff --git a/libs/rs/RenderScript.h b/libs/rs/RenderScript.h
index 7902b9a..13ae1fb 100644
--- a/libs/rs/RenderScript.h
+++ b/libs/rs/RenderScript.h
@@ -122,7 +122,8 @@
     RS_SAMPLER_MAG_FILTER,
     RS_SAMPLER_WRAP_S,
     RS_SAMPLER_WRAP_T,
-    RS_SAMPLER_WRAP_R
+    RS_SAMPLER_WRAP_R,
+    RS_SAMPLER_ANISO
 };
 
 enum RsSamplerValue {