Expose the notificationclick and notificationerror events on ServiceWorkerGlobalScope

public/web/WebServiceWorkerContextProxy.h

Index: public/web/WebServiceWorkerContextProxy.h
diff --git a/public/web/WebServiceWorkerContextProxy.h b/public/web/WebServiceWorkerContextProxy.h
index eec3d6e4f235227f25f08698fed81ea2b48af7da..366e4051f2435794173f541af572b36bd47fae45 100644
--- a/public/web/WebServiceWorkerContextProxy.h
+++ b/public/web/WebServiceWorkerContextProxy.h
@@ -37,6 +37,7 @@
 namespace blink {
 
 struct WebCircularGeofencingRegion;
+struct WebNotificationData;
 class WebServiceWorkerRequest;
 class WebString;
 
@@ -57,6 +58,9 @@ public:
 
     virtual void dispatchPushEvent(int eventID, const WebString& data) = 0;
 
+    virtual void dispatchNotificationClickEvent(int eventID, const WebNotificationData&) = 0;
+    virtual void dispatchNotificationErrorEvent(int eventID, const WebNotificationData&) = 0;
+
     // Once the ServiceWorker has finished handling the sync event
     // didHandleSyncEvent is called on the context client.
     virtual void dispatchSyncEvent(int syncEventID) = 0;