Preserve the D3D11 offscreen texture contents when the swap chain is reset (ie from window resize). TRAC #21929 Signed-off-by: Nicolas Capens Signed-off-by: Shannon Woods Author: Jamie Madill git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@1860 736b8ea6-26fd-11df-bfd4-992fa37f6226