Migrating MediaSession messages to mojo

third_party/WebKit/public/platform/modules/mediasession/media_session.mojom

+// Copyright 2016 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.
+
+module blink.mojom;
+
+import "mojo/common/common_custom_types.mojom";
+import "ui/gfx/geometry/mojo/geometry.mojom";
+import "url/mojo/url.mojom";
+
+struct MediaMetadataIcon {
+  url.mojom.Url src;
+  mojo.common.mojom.NullableString16 type;
+  array<gfx.mojom.Size> sizes;
+};
+
+struct MediaMetadata {
+  mojo.common.mojom.String16 title;
+  mojo.common.mojom.String16 artist;
+  mojo.common.mojom.String16 album;
+  array<MediaMetadataIcon> artwork;
+};
+
+interface MediaSessionService {
+  Activate(uint64 session_id) => (bool success);
+  Deactivate(uint64 session_id) => ();

[mlamouri (slow - plz ping), 2016/09/27 08:33:11]

Do we need Activate/Deactivate?

+  SetMetadata(uint64 session_id, MediaMetadata? metadata);
+};