Add support for EGL_EXT_client_extensions.

BUG=angle:490

Change-Id: Iafc476cef7a3d11b3bb3640e673c28c6df3cf2a1
Reviewed-on: https://chromium-review.googlesource.com/204566
Reviewed-by: Shannon Woods <shannonwoods@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>
3 files changed