This is so Chrome can create another D3D device on the same adapter that can
share resources with ANGLE's D3D device.
Review URL: https://codereview.appspot.com/9225046
SVN URL: https://code.google.com/p/angleproject/source/detail?r=2210
TRAC #23166

Signed-off-by: Shannon Woods
Signed-off-by: Geoff Lang
Merged-by: Jamie Madill
Author: apatrick@chromium.org

git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@2253 736b8ea6-26fd-11df-bfd4-992fa37f6226