Mark FontFaceCacheTest.MatchCombinations as flaky.

BUG=871812
TBR=rjwright@chromium.org

Change-Id: I64dc5078e3f92c18fb95b7eec1e664798bd18d26
Reviewed-on: https://chromium-review.googlesource.com/1165315
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581257}
1 file changed