Enumerate the return value of dispatchEvent so it is clear.

third_party/WebKit/Source/modules/indexeddb/IDBDatabase.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 369 matching lines @@
 void IDBDatabase::enqueueEvent(PassRefPtrWillBeRawPtr<Event> event)
 {
     ASSERT(!m_contextStopped);
     ASSERT(executionContext());
     EventQueue* eventQueue = executionContext()->eventQueue();
     event->setTarget(this);
     eventQueue->enqueueEvent(event.get());
     m_enqueuedEvents.append(event);
 }
 
-bool IDBDatabase::dispatchEventInternal(PassRefPtrWillBeRawPtr<Event> event)
+DispatchEventResult IDBDatabase::dispatchEventInternal(PassRefPtrWillBeRawPtr<Event> event)
 {
     IDB_TRACE("IDBDatabase::dispatchEvent");
     if (m_contextStopped || !executionContext())
-        return false;
+        return DispatchEventResult::CanceledBeforeDispatch;
     ASSERT(event->type() == EventTypeNames::versionchange || event->type() == EventTypeNames::close);
     for (size_t i = 0; i < m_enqueuedEvents.size(); ++i) {
         if (m_enqueuedEvents[i].get() == event.get())
             m_enqueuedEvents.remove(i);
     }
 
-    bool result = EventTarget::dispatchEventInternal(event.get());
+    DispatchEventResult result = EventTarget::dispatchEventInternal(event.get());
     if (event->type() == EventTypeNames::versionchange && !m_closePending && m_backend)
         m_backend->versionChangeIgnored();
     return result;
 }
 
 int64_t IDBDatabase::findObjectStoreId(const String& name) const
 {
     for (const auto& it : m_metadata.objectStores) {
         if (it.value.name == name) {
             ASSERT(it.key != IDBObjectStoreMetadata::InvalidId);
@@ skipping 33 matching lines @@
     return ActiveDOMObject::executionContext();
 }
 
 void IDBDatabase::recordApiCallsHistogram(IndexedDatabaseMethods method)
 {
     DEFINE_THREAD_SAFE_STATIC_LOCAL(EnumerationHistogram, apiCallsHistogram, new EnumerationHistogram("WebCore.IndexedDB.FrontEndAPICalls", IDBMethodsMax));
     apiCallsHistogram.count(method);
 }
 
 } // namespace blink