This was already implemented, it simply hooks it up to the
rest of the code. Could improve performance on some badly
behaved benchmarks.

BUG=angleproject:1390

Change-Id: I539df611d51ca085712fa8022bf8a7c1990afc65
Reviewed-on: https://chromium-review.googlesource.com/663896
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>