aura: Introduce EventInjector.

ui/aura/event_injector.h

+// 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.
+
+#ifndef UI_AURA_EVENT_INJECTOR_H_
+#define UI_AURA_EVENT_INJECTOR_H_
+
+#include "services/ui/public/interfaces/window_server_test.mojom.h"
+#include "ui/aura/aura_export.h"
+
+namespace ui {
+class Event;
+struct EventDispatchDetails;
+}
+
+namespace aura {
+
+class WindowTreeHost;
+
+class AURA_EXPORT EventInjector {

[sky, 2017/05/12 12:11:51]

Add description

+ public:
+  EventInjector();
+  ~EventInjector();
+
+  ui::EventDispatchDetails Inject(WindowTreeHost* host, ui::Event* event);
+
+ private:
+  ui::mojom::WindowServerTestPtr window_server_ptr_;
+
+  DISALLOW_COPY_AND_ASSIGN(EventInjector);
+};
+
+}  // namespace aura
+
+#endif  // UI_AURA_EVENT_INJECTOR_H_