Enumerate the return value of dispatchEvent so it is clear.

third_party/WebKit/Source/modules/indexeddb/IDBTransaction.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 326 matching lines @@
 const AtomicString& IDBTransaction::interfaceName() const
 {
     return EventTargetNames::IDBTransaction;
 }
 
 ExecutionContext* IDBTransaction::executionContext() const
 {
     return ActiveDOMObject::executionContext();
 }
 
-bool IDBTransaction::dispatchEventInternal(PassRefPtrWillBeRawPtr<Event> event)
+DispatchEventResult IDBTransaction::dispatchEventInternal(PassRefPtrWillBeRawPtr<Event> event)
 {
     IDB_TRACE("IDBTransaction::dispatchEvent");
     if (m_contextStopped || !executionContext()) {
         m_state = Finished;
-        return false;
+        return DispatchEventResult::CanceledBeforeDispatch;
     }
     ASSERT(m_state != Finished);
     ASSERT(m_hasPendingActivity);
     ASSERT(executionContext());
     ASSERT(event->target() == this);
     m_state = Finished;
 
     // Break reference cycles.
     for (auto& it : m_objectStoreMap)
         it.value->transactionFinished();
     m_objectStoreMap.clear();
     for (auto& it : m_deletedObjectStores)
         it->transactionFinished();
     m_deletedObjectStores.clear();
 
     WillBeHeapVector<RefPtrWillBeMember<EventTarget>> targets;
     targets.append(this);
     targets.append(db());
 
     // FIXME: When we allow custom event dispatching, this will probably need to change.
     ASSERT(event->type() == EventTypeNames::complete || event->type() == EventTypeNames::abort);
-    bool returnValue = IDBEventDispatcher::dispatch(event.get(), targets);
+    DispatchEventResult returnValue = IDBEventDispatcher::dispatch(event.get(), targets);
     // FIXME: Try to construct a test where |this| outlives openDBRequest and we
     // get a crash.
     if (m_openDBRequest) {
         ASSERT(isVersionChange());
         m_openDBRequest->transactionDidFinishAndDispatch();
     }
     m_hasPendingActivity = false;
     return returnValue;
 }
 
@@ skipping 17 matching lines @@
     event->setTarget(this);
     eventQueue->enqueueEvent(event);
 }
 
 WebIDBDatabase* IDBTransaction::backendDB() const
 {
     return m_database->backend();
 }
 
 } // namespace blink