Temporarily disable some FenceSync tests on Intel OpenGL. BUG=angleproject:888 Change-Id: Ia64d2f313c5ddf2ebb6efb54e205a22801fce01b Reviewed-on: https://chromium-review.googlesource.com/266503 Reviewed-by: Geoff Lang <geofflang@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>