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..542304df3921e5d6183bc039a6d411729157b131 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;
 
@@ -55,6 +56,9 @@ public:
 
     virtual void dispatchMessageEvent(const WebString& message, const WebMessagePortChannelArray& channels) = 0;
 
+    virtual void dispatchNotificationClickEvent(int eventID, const WebNotificationData&) = 0;
+    virtual void dispatchNotificationErrorEvent(int eventID, const WebNotificationData&) = 0;
+
     virtual void dispatchPushEvent(int eventID, const WebString& data) = 0;
 
     // Once the ServiceWorker has finished handling the sync event