Fix tsan failure of test FixedQueue.ConcurrentPushPopWithResize Test is accessing q.capacity() without mutex lock protection while modifying it in another thread. The fix here is to let test keep its own record of queue's capacity so that we dont need to get that from queue. Bug: chromium:1491867 Change-Id: Ie0438ed1f4525bc4021e43098b24cd37bee3ce97 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4932359 Commit-Queue: Charlie Lao <cclao@google.com> Reviewed-by: Yuxin Hu <yuxinhu@google.com>