Add an EGL_ANGLE_surface_orientation extension. BUG=angleproject:1262 Change-Id: I863c46c8557604da045447550f7d69831c9f06b5 Reviewed-on: https://chromium-review.googlesource.com/318780 Reviewed-by: Corentin Wallez <cwallez@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>