Fixed a bug where immutable textures could not have glTexSubImage called on them. TRAC #22869 Signed-off-by: Jamie Madill Signed-off-by: Shannon Woods Author: Geoff Lang git-svn-id: https://angleproject.googlecode.com/svn/branches/es3proto@2359 736b8ea6-26fd-11df-bfd4-992fa37f6226