Move adapter2D to a derived class from Allocation.

Change-Id: I7e9d8b0028ba95956476f253da38dbe64564d0da
diff --git a/graphics/java/android/renderscript/Type.java b/graphics/java/android/renderscript/Type.java
index 859369c..d98842a 100644
--- a/graphics/java/android/renderscript/Type.java
+++ b/graphics/java/android/renderscript/Type.java
@@ -47,6 +47,20 @@
     int mElementCount;
     Element mElement;
 
+    public enum CubemapFace {
+        POSITVE_X (0),
+        NEGATIVE_X (1),
+        POSITVE_Y (2),
+        NEGATIVE_Y (3),
+        POSITVE_Z (4),
+        NEGATIVE_Z (5);
+
+        int mID;
+        CubemapFace(int id) {
+            mID = id;
+        }
+    }
+
     /**
      * Return the element associated with this Type.
      *