Added stubs for all the new ES3 entry points with events and an error check to verify that the context is an ES3 context.

TRAC #22694

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

git-svn-id: https://angleproject.googlecode.com/svn/branches/es3proto@2070 736b8ea6-26fd-11df-bfd4-992fa37f6226