Media Session: passing metadata from renderer/ to browser/.

content/public/common/media_metadata.h

+// 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.
+
+#ifndef CONTENT_PUBLIC_COMMON_MEDIA_METADATA_H_
+#define CONTENT_PUBLIC_COMMON_MEDIA_METADATA_H_
+
+#include "base/strings/string16.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+// The MediaMetadata is a structure carrying information associated to a
+// content::MediaSession.
+struct CONTENT_EXPORT MediaMetadata {
+  MediaMetadata();
+  ~MediaMetadata();
+
+  bool operator==(const MediaMetadata& other) const;
+  bool operator!=(const MediaMetadata& other) const;
+
+  // Title associated to the MediaSession.
+  base::string16 title;
+
+  // Artist associated to the MediaSession.
+  base::string16 artist;
+
+  // Album associated to the MediaSession.
+  base::string16 album;
+
+  // Maximum length for all the strings inside the MediaMetadata when it is sent
+  // over IPC. The renderer process should truncate the strings before sending
+  // the MediaMetadata and the browser process must do the same when receiving
+  // it.
+  static const size_t kMaxIPCStringLength;
+};
+
+}  // namespace content
+
+#endif // CONTENT_PUBLIC_COMMON_MEDIA_METADATA_H_