BUG=angleproject:2265
TEST=angle_perftests

Change-Id: Iad93eb3e8339c8a766b25416b28102cc54d648b8
Reviewed-on: https://chromium-review.googlesource.com/967686
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>