This takes up about 2.9% of the time in performance runs.

BUG=angleproject:1161

Change-Id: I9ff98cd6f4bfd14cab0c702d5873f3fadfbcb4d7
Reviewed-on: https://chromium-review.googlesource.com/317574Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tryjob-Request: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Tested-by: Dian Xiang <dianx@google.com>