Make sure non-multi-sampled EGL configs are always exposed. It is possible for some hardware to not support multisampling on any texture formats which results in an empty sample set for all formats. BUG=angleproject:2242 Change-Id: I8148c781ec22ec02562b6a8b5d1b966c6f13915e Reviewed-on: https://chromium-review.googlesource.com/766568 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org>