Add names to worker threads Bug: angleproject:8417 Change-Id: I5841d194cb695387aa8fe48638cc025173152347 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5034797 Reviewed-by: Yuxin Hu <yuxinhu@google.com> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>