[ServiceWorker] Implement ServiceWorkerClients.openWindow().

Source/web/ServiceWorkerGlobalScopeClientImpl.cpp

Index: Source/web/ServiceWorkerGlobalScopeClientImpl.cpp
diff --git a/Source/web/ServiceWorkerGlobalScopeClientImpl.cpp b/Source/web/ServiceWorkerGlobalScopeClientImpl.cpp
index c834c21ac249d425d3218206cbf4fd1d306a30c0..3a52cb51b62b21d95a5b859631310e901ad3f556 100644
--- a/Source/web/ServiceWorkerGlobalScopeClientImpl.cpp
+++ b/Source/web/ServiceWorkerGlobalScopeClientImpl.cpp
@@ -53,6 +53,11 @@ void ServiceWorkerGlobalScopeClientImpl::getClients(WebServiceWorkerClientsCallb
     m_client.getClients(callbacks);
 }
 
+void ServiceWorkerGlobalScopeClientImpl::openWindow(const WebURL& url, WebServiceWorkerClientCallbacks* callbacks)
+{
+    m_client.openWindow(url, callbacks);
+}
+
 WebURL ServiceWorkerGlobalScopeClientImpl::scope() const
 {
     return m_client.scope();