Expose EGL_CHROMIUM_sync_control via GLX_OML_sync_control On GLX, we can expose the EGL_CHROMIUM_sync_control extension by forwarding to GLX_OML_sync_control when it's available. This will help with accurate vsync times for Chrome Bug: 1020252 Change-Id: I9b1e8cf0f8b1a548cc7cc7202fac2d0cdb01d74d Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1918104 Commit-Queue: Jonah Ryan-Davis <jonahr@google.com> Reviewed-by: Corentin Wallez <cwallez@chromium.org>