[Extensions Bindings] Introduce a supportsLazyListeners property

extensions/renderer/bindings/api_binding_js_util.cc

 // Copyright 2016 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/bindings/api_binding_js_util.h"
 
 #include "base/strings/stringprintf.h"
 #include "base/values.h"
 #include "extensions/renderer/bindings/api_event_handler.h"
 #include "extensions/renderer/bindings/api_request_handler.h"
@@ skipping 99 matching lines @@
   v8::Isolate* isolate = arguments->isolate();
   v8::HandleScope handle_scope(isolate);
   v8::Local<v8::Context> context = arguments->GetHolderCreationContext();
 
   event_handler_->RegisterArgumentMassager(context, event_name, massager);
 }
 
 void APIBindingJSUtil::CreateCustomEvent(gin::Arguments* arguments,
                                          v8::Local<v8::Value> v8_event_name,
                                          v8::Local<v8::Value> unused_schema,
-                                         bool supports_filters) {
+                                         bool supports_filters,
+                                         bool supports_lazy_listeners) {
   v8::Isolate* isolate = arguments->isolate();
   v8::HandleScope handle_scope(isolate);
   v8::Local<v8::Context> context = arguments->GetHolderCreationContext();
 
   std::string event_name;
   if (!v8_event_name->IsUndefined()) {
     if (!v8_event_name->IsString()) {
       NOTREACHED();
       return;
     }
     event_name = gin::V8ToString(v8_event_name);
   }
 
   DCHECK(!supports_filters || !event_name.empty())
       << "Events that support filters cannot be anonymous.";
+  DCHECK(!supports_lazy_listeners || !event_name.empty())
+      << "Events that support lazy listeners cannot be anonymous.";
 
   v8::Local<v8::Value> event;
   if (event_name.empty()) {
     event = event_handler_->CreateAnonymousEventInstance(context);
   } else {
     bool notify_on_change = true;
-    event = event_handler_->CreateEventInstance(event_name, supports_filters,
-                                                binding::kNoListenerMax,
-                                                notify_on_change, context);
+    event = event_handler_->CreateEventInstance(
+        event_name, supports_filters, supports_lazy_listeners,
+        binding::kNoListenerMax, notify_on_change, context);
   }
 
   arguments->Return(event);
 }
 
 void APIBindingJSUtil::CreateCustomDeclarativeEvent(
     gin::Arguments* arguments,
     const std::string& event_name,
     const std::vector<std::string>& actions_list,
     const std::vector<std::string>& conditions_list,
@@ skipping 82 matching lines @@
   exception_handler_->HandleException(context, full_message, exception);
 }
 
 void APIBindingJSUtil::SetExceptionHandler(gin::Arguments* arguments,
                                            v8::Local<v8::Function> handler) {
   exception_handler_->SetHandlerForContext(
       arguments->GetHolderCreationContext(), handler);
 }
 
 }  // namespace extensions