Renderscript samples.

Resolving name conflict in model viewer.
Adding fov projection matrix function.
Adding helper methods for blending.

Change-Id: Ibd3f1510436811398787c285845d050158bd6de8

graphics/java/android/renderscript/ProgramVertex.java

@@ -46,6 +46,9 @@ public class ProgramVertex extends Program {
         public Builder(RenderScript rs, Element in, Element out) {
             mRS = rs;
         }
+        public Builder(RenderScript rs) {
+            mRS = rs;
+        }
 
         public Builder setTextureMatrixEnable(boolean enable) {
             mTextureMatrixEnable = enable;