Roll 50: Copied IDLs, PYTHON scripts from WebKit removed deleted files in WebCore

core/events/CustomEvent.idl

Index: core/events/CustomEvent.idl
diff --git a/core/events/CustomEvent.idl b/core/events/CustomEvent.idl
index 4d4cb085c639989686d3f31d2cb996645c8f84df..ca1e27ff5cce78b37620ea5b58bf3d6db94cb977 100644
--- a/core/events/CustomEvent.idl
+++ b/core/events/CustomEvent.idl
@@ -26,14 +26,12 @@
 // https://dom.spec.whatwg.org/#interface-customevent
 
 [
-    Constructor(DOMString type, optional CustomEventInit eventInitDict),
+    // TODO(bashi): Don't use CustomConstructor. Constructor should be:
+    // Constructor(DOMString type, optional CustomEventInit eventInitDict),
+    CustomConstructor,
     Exposed=(Window,Worker),
 ] interface CustomEvent : Event {
     [Custom=Getter] readonly attribute any detail;
 
-    // FIXME: initCustomEvent()'s arguments should not be optional.
-    [Custom, Measure] void initCustomEvent([Default=Undefined] optional DOMString type,
-                                           [Default=Undefined] optional boolean bubbles,
-                                           [Default=Undefined] optional boolean cancelable,
-                                           [Default=Undefined] optional any detail);
+    [Measure,Custom=(CallEpilogue)] void initCustomEvent(DOMString type, boolean bubbles, boolean cancelable, any detail);
 };