Enumerate the return value of dispatchEvent so it is clear.

third_party/WebKit/Source/core/dom/Node.h

Index: third_party/WebKit/Source/core/dom/Node.h
diff --git a/third_party/WebKit/Source/core/dom/Node.h b/third_party/WebKit/Source/core/dom/Node.h
index 5656b0319b116c758b4f976efc1a3df8d5b93d46..e99c4889d0a5cc59b6357668ed230936b129f7dc 100644
--- a/third_party/WebKit/Source/core/dom/Node.h
+++ b/third_party/WebKit/Source/core/dom/Node.h
@@ -643,9 +643,9 @@ public:
     virtual void handleLocalEvents(Event&);
 
     void dispatchSubtreeModifiedEvent();
-    bool dispatchDOMActivateEvent(int detail, PassRefPtrWillBeRawPtr<Event> underlyingEvent);
+    DispatchEventResult dispatchDOMActivateEvent(int detail, PassRefPtrWillBeRawPtr<Event> underlyingEvent);
 
-    bool dispatchMouseEvent(const PlatformMouseEvent&, const AtomicString& eventType, int clickCount = 0, Node* relatedTarget = nullptr);
+    DispatchEventResult dispatchMouseEvent(const PlatformMouseEvent&, const AtomicString& eventType, int clickCount = 0, Node* relatedTarget = nullptr);
 
     void dispatchSimulatedClick(Event* underlyingEvent, SimulatedClickMouseEventOptions = SendNoEvents, SimulatedClickCreationScope = SimulatedClickCreationScope::FromUserAgent);
 
@@ -763,7 +763,7 @@ protected:
 
     bool addEventListenerInternal(const AtomicString& eventType, PassRefPtrWillBeRawPtr<EventListener>, const EventListenerOptions&) override;
     bool removeEventListenerInternal(const AtomicString& eventType, PassRefPtrWillBeRawPtr<EventListener>, const EventListenerOptions&) override;
-    bool dispatchEventInternal(PassRefPtrWillBeRawPtr<Event>) override;
+    DispatchEventResult dispatchEventInternal(PassRefPtrWillBeRawPtr<Event>) override;
 
     static void reattachWhitespaceSiblingsIfNeeded(Text* start);