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

Change-Id: Ibd3f1510436811398787c285845d050158bd6de8
diff --git a/graphics/java/android/renderscript/ProgramVertex.java b/graphics/java/android/renderscript/ProgramVertex.java
index ec377e2..c99efd6 100644
--- a/graphics/java/android/renderscript/ProgramVertex.java
+++ b/graphics/java/android/renderscript/ProgramVertex.java
@@ -46,6 +46,9 @@
         public Builder(RenderScript rs, Element in, Element out) {
             mRS = rs;
         }
+        public Builder(RenderScript rs) {
+            mRS = rs;
+        }
 
         public Builder setTextureMatrixEnable(boolean enable) {
             mTextureMatrixEnable = enable;