Call addRef when creating a new Fence Sync object.

BUG=angle:728

Change-Id: Iafd838c3ceb1a88afd4d3b0994e8d841945df499
Reviewed-on: https://chromium-review.googlesource.com/213142
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>
1 file changed