This migrates to the new generation style used in GLES2 and GLES3.

BUG=angleproject:2254

Change-Id: I10afa1f006ff68e8bafda2bd45dd9a048f8f7dff
Reviewed-on: https://chromium-review.googlesource.com/787172
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>