Refactor egl::Surface constructors. We can reduce the code in these classes quite a bit by calling the common code in egl::Display. BUG=angleproject:994 Change-Id: Idf0ffa054fc6a70cf8c65a0b98fd963911715591 Reviewed-on: https://chromium-review.googlesource.com/269258 Reviewed-by: Kenneth Russell <kbr@chromium.org> Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>