The new header contains EGL_NV_stream_consumer_gltexture_yuv, which will
be implemented in the future for video rendering purposes.

BUG=angleproject:1332
Change-Id: Ia35ee7360b8f09703ad2800c641c67f0f243e927
Reviewed-on: https://chromium-review.googlesource.com/330278Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Ian Ewell <ewell@google.com>