willDispatchEvent  473 Source/core/inspector/InspectorTimelineAgent.cpp bool InspectorTimelineAgent::willDispatchEvent(Document* document, const Event& event, DOMWindow* window, Node* node, const EventPath& eventPath)
willDispatchEvent   66 Source/modules/serviceworkers/WaitUntilObserver.cpp void WaitUntilObserver::willDispatchEvent()