Web Inspector: DOM: don't send the entire function string with each event listener

Web Inspector: DOM: don't send the entire function string with each event listener
https://bugs.webkit.org/show_bug.cgi?id=194293
<rdar://problem/47822809>

Reviewed by Joseph Pecoraro.

Source/JavaScriptCore:

* inspector/protocol/DOM.json:

* runtime/JSFunction.h:
Export `calculatedDisplayName`.

Source/WebCore:

Test: inspector/dom/getEventListenersForNode.html

* inspector/agents/InspectorDOMAgent.cpp:
(WebCore::InspectorDOMAgent::buildObjectForEventListener):

Source/WebInspectorUI:

* UserInterface/Views/EventListenerSectionGroup.js:
(WI.EventListenerSectionGroup.prototype._functionTextOrLink):

LayoutTests:

* inspector/dom/getEventListenersForNode.html:
* inspector/dom/getEventListenersForNode-expected.txt:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@241110 268f45cc-cd09-0410-ab3c-d52691b4dbfc