Mark flaky test as Timeout

This is another flaky test that may timeout similar to the rest. See
bug for details.

TBR=yangguo@chromium.org

Bug: 1046784
Change-Id: Ic0cb69981a299021eb80405976287b43460c4698
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2028851
Reviewed-by: Yi Gu <yigu@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736553}
1 file changed