Add single channel blur test.

Change-Id: Iec63132ab4d88290ae1bf0d71431d4fe6ec6dd25
diff --git a/graphics/java/android/renderscript/ScriptIntrinsicBlur.java b/graphics/java/android/renderscript/ScriptIntrinsicBlur.java
index 11164e3..7ffd1e7 100644
--- a/graphics/java/android/renderscript/ScriptIntrinsicBlur.java
+++ b/graphics/java/android/renderscript/ScriptIntrinsicBlur.java
@@ -46,7 +46,7 @@
      * @return ScriptIntrinsicBlur
      */
     public static ScriptIntrinsicBlur create(RenderScript rs, Element e) {
-        if (e != Element.U8_4(rs)) {
+        if ((e != Element.U8_4(rs)) && e != (Element.U8(rs))) {
             throw new RSIllegalArgumentException("Unsuported element type.");
         }
         int id = rs.nScriptIntrinsicCreate(5, e.getID(rs));