Only advertise postSubBuffer extension if we can actually present less than the whole buffer. This is not available in D3D11, though it is added in D3D11.1. TRAC #22506 Signed-off-by: Geoff Lang Signed-off-by: Nicolas Capens Author: Jamie Madill git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@1892 736b8ea6-26fd-11df-bfd4-992fa37f6226