refactor: EventEmitters without gin_helper (#22726)

shell/browser/api/electron_api_event_emitter.cc

@@ -0,0 +1,45 @@
+// Copyright (c) 2019 Slack Technologies, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "shell/browser/api/electron_api_event_emitter.h"
+
+#include "base/bind.h"
+#include "base/callback.h"
+#include "gin/dictionary.h"
+#include "shell/common/gin_converters/callback_converter.h"
+#include "shell/common/node_includes.h"
+#include "v8/include/v8.h"
+
+namespace {
+
+v8::Global<v8::Object> event_emitter_prototype;
+
+void SetEventEmitterPrototype(v8::Isolate* isolate,
+                              v8::Local<v8::Object> proto) {
+  event_emitter_prototype.Reset(isolate, proto);
+}
+
+void Initialize(v8::Local<v8::Object> exports,
+                v8::Local<v8::Value> unused,
+                v8::Local<v8::Context> context,
+                void* priv) {
+  v8::Isolate* isolate = context->GetIsolate();
+
+  gin::Dictionary dict(isolate, exports);
+  dict.Set("setEventEmitterPrototype",
+           base::BindRepeating(&SetEventEmitterPrototype));
+}
+
+}  // namespace
+
+namespace electron {
+
+v8::Local<v8::Object> GetEventEmitterPrototype(v8::Isolate* isolate) {
+  CHECK(!event_emitter_prototype.IsEmpty());
+  return event_emitter_prototype.Get(isolate);
+}
+
+}  // namespace electron
+
+NODE_LINKED_MODULE_CONTEXT_AWARE(electron_browser_event_emitter, Initialize)