Enumerate the return value of dispatchEvent so it is clear.

third_party/WebKit/Source/core/workers/WorkerMessagingProxy.cpp

Index: third_party/WebKit/Source/core/workers/WorkerMessagingProxy.cpp
diff --git a/third_party/WebKit/Source/core/workers/WorkerMessagingProxy.cpp b/third_party/WebKit/Source/core/workers/WorkerMessagingProxy.cpp
index 7aee2a7d2b3326a02550b52aee611506274b3fde..0e895616d2415e28160cebf805faca960907718d 100644
--- a/third_party/WebKit/Source/core/workers/WorkerMessagingProxy.cpp
+++ b/third_party/WebKit/Source/core/workers/WorkerMessagingProxy.cpp
@@ -172,7 +172,7 @@ void WorkerMessagingProxy::reportException(const String& errorMessage, int lineN
     // This is intentionally different than the behavior in MessageWorkerTask, because terminated workers no longer deliver messages (section 4.6 of the WebWorker spec), but they do report exceptions.
 
     RefPtrWillBeRawPtr<ErrorEvent> event = ErrorEvent::create(errorMessage, sourceURL, lineNumber, columnNumber, nullptr);
-    bool errorHandled = !m_workerObject->dispatchEvent(event);
+    bool errorHandled = m_workerObject->dispatchEvent(event) != WebInputEventResult::NotHandled;
     postTaskToWorkerGlobalScope(createCrossThreadTask(&processExceptionOnWorkerGlobalScope, exceptionId, errorHandled));

[tkent, 2015/12/03 00:36:25]

Can we change the bool argument of processExceptionOnWorkerGlobalScopt to
WebInputEventResult? Or add a TODO() comment?

[dtapuska, 2015/12/03 02:00:53]

I tried this but:

We can't really change the processExceptionOnWorkerGlobalScope without defining
a template for cross thread task copying of WebInputEventResult...

It is an enum class so I guess we need to define a variant of it in the
CrossThreadCopy which I think is overkill for this. If you feel different please
advise.

 }