ServiceWorker: add ServiceWorkerClients.claim() support (1/3).

Source/web/ServiceWorkerGlobalScopeClientImpl.cpp

Index: Source/web/ServiceWorkerGlobalScopeClientImpl.cpp
diff --git a/Source/web/ServiceWorkerGlobalScopeClientImpl.cpp b/Source/web/ServiceWorkerGlobalScopeClientImpl.cpp
index 58030a0297b325cc692db158639d4ea92f9afd56..7dd323571d3e6831199a5436e951afb61aec6511 100644
--- a/Source/web/ServiceWorkerGlobalScopeClientImpl.cpp
+++ b/Source/web/ServiceWorkerGlobalScopeClientImpl.cpp
@@ -118,6 +118,11 @@ void ServiceWorkerGlobalScopeClientImpl::skipWaiting(WebServiceWorkerSkipWaiting
     m_client.skipWaiting(callbacks);
 }
 
+void ServiceWorkerGlobalScopeClientImpl::claim(WebServiceWorkerClientsClaimCallbacks* callbacks)
+{
+    m_client.claim(callbacks);
+}
+
 void ServiceWorkerGlobalScopeClientImpl::focus(int clientID, WebServiceWorkerClientFocusCallback* callback)
 {
     m_client.focus(clientID, callback);