Mark tests that fail or hang on Nexus 5X as such.

BUG=angleproject:1532
TEST=gles3 tests pass on Nexus 5X

Change-Id: Id4c31884890bd48595a83be14e8d56342f7fbe59
Reviewed-on: https://chromium-review.googlesource.com/387148Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>