[Extensions Bindings] Introduce a supportsLazyListeners property

extensions/renderer/chrome_setting.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/renderer/chrome_setting.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/values.h"
 #include "extensions/renderer/bindings/api_event_handler.h"
@@ skipping 99 matching lines @@
       isolate, gin::StringToSymbol(isolate, "onChangeEvent"));
   v8::Local<v8::Value> event;
   if (!wrapper->GetPrivate(context, key).ToLocal(&event)) {
     NOTREACHED();
     return v8::Local<v8::Value>();
   }
 
   DCHECK(!event.IsEmpty());
   if (event->IsUndefined()) {
     bool supports_filters = false;
+    bool supports_lazy_listeners = true;
     event = event_handler_->CreateEventInstance(
         base::StringPrintf("types.ChromeSetting.%s.onChange",
                            pref_name_.c_str()),
-        supports_filters, binding::kNoListenerMax, true, context);
+        supports_filters, supports_lazy_listeners, binding::kNoListenerMax,
+        true, context);
     v8::Maybe<bool> set_result = wrapper->SetPrivate(context, key, event);
     if (!set_result.IsJust() || !set_result.FromJust()) {
       NOTREACHED();
       return v8::Local<v8::Value>();
     }
   }
   return event;
 }
 
 void ChromeSetting::HandleFunction(const std::string& method_name,
@@ skipping 19 matching lines @@
     return;
   }
 
   converted_arguments->Insert(0u, base::MakeUnique<base::Value>(pref_name_));
   request_handler_->StartRequest(
       context, full_name, std::move(converted_arguments), callback,
       v8::Local<v8::Function>(), binding::RequestThread::UI);
 }
 
 }  // namespace extensions