base

1. Add Context to a RenderScript or RenderScriptGL instance.
   This is to allow RenderScript to better interact with the Android environment.
   E.g., per-app cache.
2. Plumbing, testing.
3. Added getApplicationContext in RenderScript.java.

Change-Id: I85edeebe38825e20b2e86f4f4815689dfc332ef9