[PATCH] mshtml.idl: Add IDOMCustomEvent declaration.

[Jacek Caban]

Signed-off-by: Jacek Caban <jacek(a)codeweavers.com>
---
  include/mshtmdid.h |  4 ++++
  include/mshtml.idl | 46 ++++++++++++++++++++++++++++++++++++++++++++++
  2 files changed, 50 insertions(+)