Add a new internal enum for shader type, instead of re-using GL enums. TRAC #22412 Signed-off-by: Nicolas Capens Signed-off-by: Shannon Woods Author: Jamie Madill git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@1783 736b8ea6-26fd-11df-bfd4-992fa37f6226