Send AndroidOverlay routing token from WMPI to AVDA.

media/base/overlay_info.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 MEDIA_BASE_OVERLAY_INFO_H_
+#define MEDIA_BASE_OVERLAY_INFO_H_
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/optional.h"
+#include "base/unguessable_token.h"
+
+namespace media {
+
+// Request information to construct an overlay.  This can be either a surface_id
+// or an AndroidOverlay routing token.
+using ProvideOverlayInfoCB =
+    base::Callback<void(int, const base::Optional<base::UnguessableToken>&)>;
+using RequestOverlayInfoCB =
+    base::Callback<void(bool, const ProvideOverlayInfoCB&)>;
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_OVERLAY_INFO_H_