add strawman hit notify interface (not part of build)

mailnews/base/search/public/nsIMsgSearchHitNotify.idl

@@ -0,0 +1,33 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * The contents of this file are subject to the Netscape Public
+ * License Version 1.1 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.mozilla.org/NPL/
+ *
+ * Software distributed under the License is distributed on an "AS
+ * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+ * implied. See the License for the specific language governing
+ * rights and limitations under the License.
+ *
+ * The Original Code is mozilla.org code.
+ *
+ * The Initial Developer of the Original Code is Netscape
+ * Communications Corporation.  Portions created by Netscape are
+ * Copyright (C) 1999 Netscape Communications Corporation. All
+ * Rights Reserved.
+ *
+ * Contributor(s):
+ * Alec Flett <alecf@netscape.com>
+ */
+
+#include "nsIMsgHdr.idl"
+
+// when a search is run, this interface is passed in as a listener
+// on the search.
+[scriptable, uuid(ca37784d-352b-4c39-8ccb-0abc1a93f681)]
+interface nsIMsgSearchHitNotify : nsISupports
+{
+  void onSearchHit(in nsIMsgHdr header);
+};
+