Add a new header for some constants from Context.h.

TRAC #22518

Signed-off-by: Geoff Lang
Signed-off-by: Shannon Woods
Author: Jamie Madill

git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@1936 736b8ea6-26fd-11df-bfd4-992fa37f6226
5 files changed