eglplatform: add Wayland version of native EGL types BUG=angleproject:2105 Change-Id: I46e5f4458be830e27345fc04ad4c9fd6e98aa946 Reviewed-on: https://chromium-review.googlesource.com/575200 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org>