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

Source/web/ServiceWorkerGlobalScopeClientImpl.cpp

Index: Source/web/ServiceWorkerGlobalScopeClientImpl.cpp
diff --git a/Source/web/ServiceWorkerGlobalScopeClientImpl.cpp b/Source/web/ServiceWorkerGlobalScopeClientImpl.cpp
index edc43cc2f553e6bcb2b955a5444a36016f4ed070..f63da915bb9cbad10dd4c2f7506763f539165e2f 100644
--- a/Source/web/ServiceWorkerGlobalScopeClientImpl.cpp
+++ b/Source/web/ServiceWorkerGlobalScopeClientImpl.cpp
@@ -108,6 +108,11 @@ void ServiceWorkerGlobalScopeClientImpl::skipWaiting(WebServiceWorkerSkipWaiting
     m_client.skipWaiting(callbacks);
 }
 
+void ServiceWorkerGlobalScopeClientImpl::focus(int clientID, WebServiceWorkerClientFocusCallback* callback)
+{
+    m_client.focus(clientID, callback);
+}
+
 ServiceWorkerGlobalScopeClientImpl::ServiceWorkerGlobalScopeClientImpl(WebServiceWorkerContextClient& client)
     : m_client(client)
 {