Split MediaContentType and AudioFocusType

media/base/media_content_type.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 MEDIA_BASE_MEDIA_CONTENT_TYPE_H_
+#define MEDIA_BASE_MEDIA_CONTENT_TYPE_H_
+
+#include "base/time/time.h"
+#include "media/base/media_export.h"
+
+namespace media {
+
+// The content type of a media player, which will be used by MediaSession to
+// control its players.
+enum class MediaContentType {

[mlamouri (slow - plz ping), 2016/08/18 14:33:15]

I'm not a huge fan of the name but I don't really have a better suggestion.

+  // Type indicating that a player is primary content on the page.
+  Content,
+  // Type indicating that a player only plays a transient sound.
+  Transient,
+  // Type indicating that a player cannot be paused. MediaSession may duck the
+  // player instead of pausing it.
+  Unpausable,
+  // Type indicating that a player cannot be controlled. MediaSession wil ignore
+  // this player.
+  Uncontrollable
+};
+
+// Utility function for deciding whether a player is treated as Content type by

[mlamouri (slow - plz ping), 2016/08/18 14:33:15]

nit: s/treated as Content type by/treated as Content based on/ (I think)

+// its duration.
+MEDIA_EXPORT MediaContentType
+DurationToMediaContentType(base::TimeDelta duration);
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_MEDIA_CONTENT_TYPE_H_