[Extensions Bindings] Introduce a supportsLazyListeners property

extensions/renderer/resources/web_request_event.js

Index: extensions/renderer/resources/web_request_event.js
diff --git a/extensions/renderer/resources/web_request_event.js b/extensions/renderer/resources/web_request_event.js
index 1806bfdbe431221f3fb0e300d4d6f62b4b2370f2..8e55f5ad53d23d0e2594ad4f7f2fac7be9ad68be 100644
--- a/extensions/renderer/resources/web_request_event.js
+++ b/extensions/renderer/resources/web_request_event.js
@@ -16,8 +16,13 @@ function getUniqueSubEventName(eventName) {
 }
 
 function createSubEvent(name, argSchemas) {
-  if (bindingUtil)
-    return bindingUtil.createCustomEvent(name, undefined, false);
+  if (bindingUtil) {
+    var supportsFilters = false;
+    var supportsLazyListeners = true;
+    return bindingUtil.createCustomEvent(name, undefined,
+                                         supportsFilters,
+                                         supportsLazyListeners);
+  }
   return new eventBindings.Event(name, argSchemas);
 }