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

BUG=angleproject:1471
TEST=gles2 tests pass on Nexus 5X

Change-Id: I3de8ce3e472f9c75bd18140bf9aa4d79a73cb22d
Reviewed-on: https://chromium-review.googlesource.com/377703Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>