Use SemaphoreID in place of GLuint handle Bug: angleproject:3804 Change-Id: Iabaae60ed7cbbe423bf768c506099d26cf0dedcf Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1768978 Commit-Queue: Jiacheng Lu <lujc@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>