Implement RS tracked defered texture and buffer object uploads.
diff --git a/libs/rs/rsContext.h b/libs/rs/rsContext.h
index 708551c..426f921 100644
--- a/libs/rs/rsContext.h
+++ b/libs/rs/rsContext.h
@@ -94,6 +94,7 @@
     const ProgramVertex * getVertex() {return mVertex.get();}
 
     void setupCheck();
+    bool checkDriver() const {return mEGL.mSurface != 0;}
 
     void pause();
     void resume();