Handle non-zero base level with mipmapping disabled in D3D9. BUG=angleproject:970 Change-Id: I33120ec8121dc1265360fbbe61103e03e593af3f Reviewed-on: https://chromium-review.googlesource.com/286550 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>