[POC-WIP] Link window focus tokens with ExecutionContext.

Source/web/ServiceWorkerGlobalScopeProxy.cpp

Index: Source/web/ServiceWorkerGlobalScopeProxy.cpp
diff --git a/Source/web/ServiceWorkerGlobalScopeProxy.cpp b/Source/web/ServiceWorkerGlobalScopeProxy.cpp
index 69bdcc07b8d3b9889bb7828209471e62d6fde637..bd45b64390f57d08280c9087d6e1e2825bc128c1 100644
--- a/Source/web/ServiceWorkerGlobalScopeProxy.cpp
+++ b/Source/web/ServiceWorkerGlobalScopeProxy.cpp
@@ -124,6 +124,7 @@ void ServiceWorkerGlobalScopeProxy::dispatchMessageEvent(const WebString& messag
 void ServiceWorkerGlobalScopeProxy::dispatchNotificationClickEvent(int eventID, const WebString& notificationID, const WebNotificationData& data)
 {
     ASSERT(m_workerGlobalScope);
+    m_workerGlobalScope->giveWindowFocusToken();
     WaitUntilObserver* observer = WaitUntilObserver::create(m_workerGlobalScope, WaitUntilObserver::NotificationClick, eventID);
     // FIXME: Initialize a Notification object based on |notificationID| and |data|.
     NotificationEventInit eventInit;