Fixing bitmap invalidation bug.

Change-Id: I47776f2c1a567342f0826850237c15a5d6315f71
diff --git a/graphics/jni/android_renderscript_RenderScript.cpp b/graphics/jni/android_renderscript_RenderScript.cpp
index 4a85faf..3476bd5 100644
--- a/graphics/jni/android_renderscript_RenderScript.cpp
+++ b/graphics/jni/android_renderscript_RenderScript.cpp
@@ -504,6 +504,7 @@
     void* ptr = bitmap.getPixels();
     rsAllocationCopyToBitmap(con, (RsAllocation)alloc, ptr, bitmap.getSize());
     bitmap.unlockPixels();
+    bitmap.notifyPixelsChanged();
 }
 
 static void ReleaseBitmapCallback(void *bmp)