Causes random timeouts.

Bug: angleproject:2932, angleproject:3153
Change-Id: I69a200684afab9e00642850bfa8e8efd0da5ad1d
Reviewed-on: https://chromium-review.googlesource.com/c/1495229Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@google.com>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>