Enumerate the return value of dispatchEvent so it is clear.

third_party/WebKit/Source/core/events/Event.h

Index: third_party/WebKit/Source/core/events/Event.h
diff --git a/third_party/WebKit/Source/core/events/Event.h b/third_party/WebKit/Source/core/events/Event.h
index 8d296d982792a332cf61dd7c513e15b08508cf87..df8f1bd2ca22b110be29b2d82d4c2600bbd2de4e 100644
--- a/third_party/WebKit/Source/core/events/Event.h
+++ b/third_party/WebKit/Source/core/events/Event.h
@@ -201,6 +201,15 @@ public:
     bool isTrusted() const { return m_isTrusted; }
     void setTrusted(bool value) { m_isTrusted = value; }
 
+    WebInputEventResult eventResult() const
+    {
+        if (defaultPrevented())
+            return WebInputEventResult::HandledApplication;
+        if (defaultHandled())
+            return WebInputEventResult::HandledSystem;
+        return WebInputEventResult::NotHandled;
+    }
+
     DECLARE_VIRTUAL_TRACE();
 
 protected: