Web Inspector: provide a way to enable/disable event listeners

Web Inspector: provide a way to enable/disable event listeners
https://bugs.webkit.org/show_bug.cgi?id=177451

Reviewed by Joseph Pecoraro.

Source/JavaScriptCore:

* inspector/protocol/DOM.json:
Add `setEventListenerDisabled` command that enables/disables a specific event listener
during event dispatch. When a disabled event listener is fired, the listener's callback will
not be called.

Source/WebCore:

Test: inspector/dom/setEventListenerDisabled.html

* dom/EventTarget.cpp:
(WebCore::EventTarget::fireEventListeners):
Add InspectorInstrumentation call to isEventListenerDisabled. If true, the event listener's
callback will not be called.

* inspector/InspectorDOMAgent.h:
* inspector/InspectorDOMAgent.cpp:
(WebCore::InspectorDOMAgent::discardBindings):
(WebCore::InspectorDOMAgent::getEventListenersForNode):
(WebCore::InspectorDOMAgent::setEventListenerDisabled):
(WebCore::InspectorDOMAgent::buildObjectForEventListener):
(WebCore::InspectorDOMAgent::willRemoveEventListener):
(WebCore::InspectorDOMAgent::isEventListenerDisabled):
Introduce a mapping of `EventListener*` to `InspectorEventListener`, a struct for uniquely
identifying event listeners so they can be referenced from the frontend. We only add items
to this mapping when `getEventListenersForNode` is called, as that is when EventListener
data is sent to the frontend. This allows us to defer creating an Inspector "mirror" object
for each EventListener until it is needed. Items are removed whenever an event listener is
removed or when the document changes.

* inspector/InspectorInstrumentation.h:
(WebCore::InspectorInstrumentation::isEventListenerDisabled):
* inspector/InspectorInstrumentation.cpp:
(WebCore::InspectorInstrumentation::willRemoveEventListenerImpl):
(WebCore::InspectorInstrumentation::isEventListenerDisabledImpl):
Pass additional parameters to InspectorDOMAgent so it can determine if the event listener
actually exists. If not, don't dispatch an event to the frontend as nothing will change.

Source/WebInspectorUI:

* Localizations/en.lproj/localizedStrings.js:

* UserInterface/Controllers/DOMTreeManager.js:
(WI.DOMTreeManager.prototype.setEventListenerDisabled):

* UserInterface/Views/DOMNodeDetailsSidebarPanel.js:
(WI.DOMNodeDetailsSidebarPanel.prototype.attached):
(WI.DOMNodeDetailsSidebarPanel.prototype.detached):
(WI.DOMNodeDetailsSidebarPanel.prototype._eventListenersChanged):
(WI.DOMNodeDetailsSidebarPanel.prototype.addEventListeners): Deleted.
(WI.DOMNodeDetailsSidebarPanel.prototype.removeEventListeners): Deleted.
Listen for `WI.DOMNode.Event.EventListenersChanged` on all instances of WI.DOMNode, since we
will still want to refresh the event listeners section in the event that an event listener
is removed from a parent node.

* UserInterface/Views/EventListenerSectionGroup.js:
(WI.EventListenerSectionGroup):
(WI.EventListenerSectionGroup.prototype._eventText):
(WI.EventListenerSectionGroup.prototype._nodeTextOrLink):
(WI.EventListenerSectionGroup.prototype._createDisabledToggleElement):
(WI.EventListenerSectionGroup.prototype._createDisabledToggleElement.updateTitle):
* UserInterface/Views/EventListenerSectionGroup.css:
(.event-listener-section > .content input[type="checkbox"]):

* UserInterface/Views/DetailsSectionSimpleRow.js:
(WI.DetailsSectionSimpleRow.prototype.get label):
(WI.DetailsSectionSimpleRow.prototype.set label):

LayoutTests:

* inspector/dom/setEventListenerDisabled-expected.txt: Added.
* inspector/dom/setEventListenerDisabled.html: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@223321 268f45cc-cd09-0410-ab3c-d52691b4dbfc