Add blur intrinsic to C++.

Change-Id: I5cfc5873a1bda949619f96787cd68bb92cc48f8f
diff --git a/cpp/rsCppStructs.h b/cpp/rsCppStructs.h
index a936d47..a5df611 100644
--- a/cpp/rsCppStructs.h
+++ b/cpp/rsCppStructs.h
@@ -551,6 +551,13 @@
     void blendSubtract(sp<Allocation> in, sp<Allocation> out);
 };
 
+class ScriptIntrinsicBlur : public ScriptIntrinsic {
+ public:
+    ScriptIntrinsicBlur(sp<RS> rs, Element *e);
+    void blur(sp<Allocation> in, sp<Allocation> out);
+    void setRadius(float radius);
+};
+
 }
 
 }