Adding anisotropic filtering and related samples.

Change-Id: Idb173274417feb5e25bfd64c5e9fa2492a23a17e
diff --git a/libs/rs/rsSampler.h b/libs/rs/rsSampler.h
index 32a8efd..4946355 100644
--- a/libs/rs/rsSampler.h
+++ b/libs/rs/rsSampler.h
@@ -36,7 +36,8 @@
             RsSamplerValue minFilter,
             RsSamplerValue wrapS,
             RsSamplerValue wrapT,
-            RsSamplerValue wrapR);
+            RsSamplerValue wrapR,
+            float aniso = 1.0f);
 
     virtual ~Sampler();
 
@@ -56,6 +57,7 @@
     RsSamplerValue mWrapS;
     RsSamplerValue mWrapT;
     RsSamplerValue mWrapR;
+    float mAniso;
 
     int32_t mBoundSlot;
 
@@ -74,6 +76,7 @@
     RsSamplerValue mWrapS;
     RsSamplerValue mWrapT;
     RsSamplerValue mWrapR;
+    float mAniso;
 
 
     ObjectBaseRef<Sampler> mSamplers[RS_MAX_SAMPLER_SLOT];