Only sync the VAO state just before the draw call. BUG=angleproject:880 Change-Id: Ifd59c0f67aeab0e4700b3dca57c1b75e3fae48b8 Reviewed-on: https://chromium-review.googlesource.com/257671 Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>