Adding XMPP ping functionality to CLoudPrint. XMPP ping and timeout is controlled thorugh Service S…

jingle/notifier/listener/push_client_observer.h

Index: jingle/notifier/listener/push_client_observer.h
diff --git a/jingle/notifier/listener/push_client_observer.h b/jingle/notifier/listener/push_client_observer.h
index d51deb290b113c64a023cb74e7f9ba02f135fdbc..d153ff0cc97d6a514a98c2c71cffc8545d0e752e 100644
--- a/jingle/notifier/listener/push_client_observer.h
+++ b/jingle/notifier/listener/push_client_observer.h
@@ -39,6 +39,10 @@ class PushClientObserver {
   // Called when a notification is received.  The details of the
   // notification are in |notification|.
   virtual void OnIncomingNotification(const Notification& notification) = 0;
+
+  // Called when a ping response is received. Default implementation does
+  // nothing.
+  virtual void OnPingResponse();
 };
 
 }  // namespace notifier