Add native_mate implemented Event and EventEmitter.

atom/browser/api/event_emitter.h

@@ -0,0 +1,33 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_BROWSER_API_EVENT_EMITTER_H_
+#define ATOM_BROWSER_API_EVENT_EMITTER_H_
+
+#include "native_mate/wrappable.h"
+
+namespace base {
+class ListValue;
+}
+
+namespace mate {
+
+// Provide helperers to emit event in JavaScript.
+class EventEmitter : public Wrappable {
+ protected:
+  EventEmitter();
+
+  // this.emit(name);
+  bool Emit(const base::StringPiece& name);
+
+  // this.emit(name, args...);
+  bool Emit(const base::StringPiece& name, const base::ListValue& args);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(EventEmitter);
+};
+
+}  // namespace mate
+
+#endif  // ATOM_BROWSER_API_EVENT_EMITTER_H_