BUG=angleproject:2258

Change-Id: I280eb0e461fd749b01594bb1bb9a417f2cbc23fa
Reviewed-on: https://chromium-review.googlesource.com/793975Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>