This extension is core in 3.2

Based on a CL by Jonah Ryan-Davis.

Bug: angleproject:3573
Bug: angleproject:4933
Change-Id: Ib5ce038414075a5cdce36e9404e25d7af33fb39c
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2519401
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Cody Northrop <cnorthrop@google.com>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>