BUG=angleproject:1002

Change-Id: I4305db01c0ca40fd0ccf0dd441744b6184d5e945
Reviewed-on: https://chromium-review.googlesource.com/270770Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Austin Kinross <aukinros@microsoft.com>