ServiceWorker: Issue a warning after initial execution of worker script

Source/core/workers/WorkerGlobalScope.cpp

Index: Source/core/workers/WorkerGlobalScope.cpp
diff --git a/Source/core/workers/WorkerGlobalScope.cpp b/Source/core/workers/WorkerGlobalScope.cpp
index b9d97fe844cd665052990fcc4efc74421528a5eb..0fad7c248db6fab228a78d83e79e43c2a95586da 100644
--- a/Source/core/workers/WorkerGlobalScope.cpp
+++ b/Source/core/workers/WorkerGlobalScope.cpp
@@ -215,6 +215,10 @@ void WorkerGlobalScope::dispose()
     // scope are gone.
 }
 
+void WorkerGlobalScope::didEvaluateWorkerScript()
+{
+}
+
 void WorkerGlobalScope::importScripts(const Vector<String>& urls, ExceptionState& exceptionState)
 {
     ASSERT(contentSecurityPolicy());