Add support for linking to a skia bitmap rather than always copying the data from the bitmap.
diff --git a/libs/rs/RenderScript.h b/libs/rs/RenderScript.h
index 0c95e7d..cd8361c 100644
--- a/libs/rs/RenderScript.h
+++ b/libs/rs/RenderScript.h
@@ -46,6 +46,8 @@
 typedef void * RsProgramFragmentStore;
 typedef void * RsProgramRaster;
 
+typedef void (* RsBitmapCallback_t)(void *);
+
 enum RsDeviceParam {
     RS_DEVICE_PARAM_FORCE_SOFTWARE_GL,
     RS_DEVICE_PARAM_COUNT