Auto merge of #19288 - m-novikov:impl-eventtarget-constructor, r=KiChjang

Implement EventTarget constructor

Resolves #19283
Do "Wrap" functions only created for elements that aren't marked Abstract in .webidl file?
How can I see code that was generated from webidls?

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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #19283 (github issue number if applicable).

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components/script/dom/eventtarget.rs

@@ -15,18 +15,20 @@ use dom::bindings::codegen::Bindings::EventListenerBinding::EventListener;
 use dom::bindings::codegen::Bindings::EventTargetBinding::AddEventListenerOptions;
 use dom::bindings::codegen::Bindings::EventTargetBinding::EventListenerOptions;
 use dom::bindings::codegen::Bindings::EventTargetBinding::EventTargetMethods;
+use dom::bindings::codegen::Bindings::EventTargetBinding::Wrap;
 use dom::bindings::codegen::Bindings::WindowBinding::WindowMethods;
 use dom::bindings::codegen::UnionTypes::AddEventListenerOptionsOrBoolean;
 use dom::bindings::codegen::UnionTypes::EventListenerOptionsOrBoolean;
 use dom::bindings::codegen::UnionTypes::EventOrString;
 use dom::bindings::error::{Error, Fallible, report_pending_exception};
 use dom::bindings::inheritance::Castable;
-use dom::bindings::reflector::{DomObject, Reflector};
+use dom::bindings::reflector::{DomObject, Reflector, reflect_dom_object};
 use dom::bindings::root::DomRoot;
 use dom::bindings::str::DOMString;
 use dom::element::Element;
 use dom::errorevent::ErrorEvent;
 use dom::event::{Event, EventBubbles, EventCancelable, EventStatus};
+use dom::globalscope::GlobalScope;
 use dom::node::document_from_node;
 use dom::virtualmethods::VirtualMethods;
 use dom::window::Window;
@@ -291,6 +293,16 @@ impl EventTarget {
         }
     }
 
+    fn new(global: &GlobalScope) -> DomRoot<EventTarget> {
+        reflect_dom_object(Box::new(EventTarget::new_inherited()),
+                           global,
+                           Wrap)
+    }
+
+    pub fn Constructor(global: &GlobalScope) -> Fallible<DomRoot<EventTarget>> {
+        Ok(EventTarget::new(global))
+    }
+
     pub fn get_listeners_for(&self,
                              type_: &Atom,
                              specific_phase: Option<ListenerPhase>)

components/script/dom/webidls/EventTarget.webidl

@@ -5,7 +5,7 @@
  * https://dom.spec.whatwg.org/#interface-eventtarget
  */
 
-[Abstract, Exposed=(Window,Worker,Worklet)]
+[Constructor, Exposed=(Window,Worker,Worklet)]
 interface EventTarget {
   void addEventListener(
     DOMString type,