New functions are only unimplemented when there's a context.

TRAC #23055
Signed-off-by: Jamie Madill
Signed-off-by: Shannon Woods
Author: Nicolas Capens

git-svn-id: https://angleproject.googlecode.com/svn/branches/es3proto@2382 736b8ea6-26fd-11df-bfd4-992fa37f6226