This was probably omittted some time ago, and was showing up as
garbage in the debugger in some cases.

BUG=angleproject:1260

Change-Id: Ifca5243d0c94e7659a2245e327a72eed9dd918ab
Reviewed-on: https://chromium-review.googlesource.com/327401Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>