[Extensions Bindings] Introduce a supportsLazyListeners property

extensions/renderer/resources/guest_view/guest_view_events.js

Index: extensions/renderer/resources/guest_view/guest_view_events.js
diff --git a/extensions/renderer/resources/guest_view/guest_view_events.js b/extensions/renderer/resources/guest_view/guest_view_events.js
index 870868dd3dafb242837d169e1c0c33d48753c5e5..1417c230713b8367f538e6ba595e8c4d4597a6a5 100644
--- a/extensions/renderer/resources/guest_view/guest_view_events.js
+++ b/extensions/renderer/resources/guest_view/guest_view_events.js
@@ -11,9 +11,16 @@ var EventBindings;
 var CreateEvent = function(name) {
   if (bindingUtil) {
     return bindingUtil.createCustomEvent(name, null,
-                                         true /* supportsFilters */);
+                                         true /* supportsFilters */,
+                                         false /* supportsLazyListeners */);
   }
-  var eventOpts = {supportsListeners: true, supportsFilters: true};
+  var eventOpts = {
+    __proto__: null,
+    supportsListeners: true,
+    supportsFilters: true,
+    // GuestView-related events never support lazy listeners.
+    supportsLazyListeners: false,
+  };
   if (!EventBindings)
     EventBindings = require('event_bindings');
   return new EventBindings.Event(name, undefined, eventOpts);