Ensure that Android can deal with concurrent write requests.

Change-Id: Ib4f8381a1975e17b5b142f49e0f3f32398a46bfb
Reviewed-by: Timur Pocheptsov <Timur.Pocheptsov@digia.com>
Reviewed-by: Alex Blasche <alexander.blasche@theqtcompany.com>