Add video player (#2)

https://github.com/sony/flutter-embedded-linux/issues/124

packages/video_player/elinux/messages/messages.h

@@ -0,0 +1,16 @@
+// Copyright 2013 The Flutter 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 PACKAGES_VIDEO_PLAYER_VIDEO_PLAYER_ELINUX_MESSAGES_MESSAGES_H_
+#define PACKAGES_VIDEO_PLAYER_VIDEO_PLAYER_ELINUX_MESSAGES_MESSAGES_H_
+
+#include "create_message.h"
+#include "looping_message.h"
+#include "mix_with_others_message.h"
+#include "playback_speed_message.h"
+#include "position_message.h"
+#include "texture_message.h"
+#include "volume_message.h"
+
+#endif  // PACKAGES_VIDEO_PLAYER_VIDEO_PLAYER_ELINUX_MESSAGES_MESSAGES_H_