ServiceWorker: Issue a warning after initial execution of worker script

Source/modules/serviceworkers/ServiceWorkerGlobalScope.cpp

Index: Source/modules/serviceworkers/ServiceWorkerGlobalScope.cpp
diff --git a/Source/modules/serviceworkers/ServiceWorkerGlobalScope.cpp b/Source/modules/serviceworkers/ServiceWorkerGlobalScope.cpp
index d0b455dfd9bb1dc9b772c2cf460ee669cd71647e..0ebb688687089cf41970d41edfb3110fadcf1dfb 100644
--- a/Source/modules/serviceworkers/ServiceWorkerGlobalScope.cpp
+++ b/Source/modules/serviceworkers/ServiceWorkerGlobalScope.cpp
@@ -65,6 +65,7 @@ PassRefPtrWillBeRawPtr<ServiceWorkerGlobalScope> ServiceWorkerGlobalScope::creat
 ServiceWorkerGlobalScope::ServiceWorkerGlobalScope(const KURL& url, const String& userAgent, ServiceWorkerThread* thread, double timeOrigin, const SecurityOrigin* starterOrigin, PassOwnPtrWillBeRawPtr<WorkerClients> workerClients)
     : WorkerGlobalScope(url, userAgent, thread, timeOrigin, starterOrigin, workerClients)
     , m_fetchManager(adoptPtr(new FetchManager(this)))
+    , m_didEvaluateScript(false)
 {
 }
 
@@ -72,6 +73,11 @@ ServiceWorkerGlobalScope::~ServiceWorkerGlobalScope()
 {
 }
 
+void ServiceWorkerGlobalScope::didEvaluateWorkerScript()
+{
+    m_didEvaluateScript = true;
+}
+
 void ServiceWorkerGlobalScope::stopFetch()
 {
     m_fetchManager.clear();
@@ -165,6 +171,20 @@ void ServiceWorkerGlobalScope::close(ExceptionState& exceptionState)
     exceptionState.throwDOMException(InvalidAccessError, "Not supported.");
 }
 
+bool ServiceWorkerGlobalScope::addEventListener(const AtomicString& eventType, PassRefPtr<EventListener> listener, bool useCapture)
+{
+    if (m_didEvaluateScript) {
+        if (eventType == EventTypeNames::install) {
+            RefPtrWillBeRawPtr<ConsoleMessage> consoleMessage = ConsoleMessage::create(JSMessageSource, WarningMessageLevel, "Event handler of 'install' event must be added on the initial evaluation of worker script.");
+            addMessageToWorkerConsole(consoleMessage.release());
+        } else if (eventType == EventTypeNames::activate) {
+            RefPtrWillBeRawPtr<ConsoleMessage> consoleMessage = ConsoleMessage::create(JSMessageSource, WarningMessageLevel, "Event handler of 'activate' event must be added on the initial evaluation of worker script.");
+            addMessageToWorkerConsole(consoleMessage.release());
+        }
+    }
+    return WorkerGlobalScope::addEventListener(eventType, listener, useCapture);
+}
+
 const AtomicString& ServiceWorkerGlobalScope::interfaceName() const
 {
     return EventTargetNames::ServiceWorkerGlobalScope;