ServiceWorker: Detect forcible worker thread termination in a correct way

third_party/WebKit/Source/modules/serviceworkers/ServiceWorkerGlobalScope.cpp

Index: third_party/WebKit/Source/modules/serviceworkers/ServiceWorkerGlobalScope.cpp
diff --git a/third_party/WebKit/Source/modules/serviceworkers/ServiceWorkerGlobalScope.cpp b/third_party/WebKit/Source/modules/serviceworkers/ServiceWorkerGlobalScope.cpp
index ddb90f1ce27bad4efbf4a1e360210dc73f42fad2..144f0b649f54ede118ad8d47fb2d97f6b80cdeed 100644
--- a/third_party/WebKit/Source/modules/serviceworkers/ServiceWorkerGlobalScope.cpp
+++ b/third_party/WebKit/Source/modules/serviceworkers/ServiceWorkerGlobalScope.cpp
@@ -186,8 +186,12 @@ void ServiceWorkerGlobalScope::dispatchExtendableEvent(Event* event, WaitUntilOb
 
     observer->willDispatchEvent();
     dispatchEvent(event);
-    if (thread()->terminated())
+
+    // Check if the worker thread is forcibly terminated during the event
+    // because of timeout etc.
+    if (thread()->isForciblyTerminated())
         m_hadErrorInTopLevelEventHandler = true;
+
     observer->didDispatchEvent(m_hadErrorInTopLevelEventHandler);
 }