Move audio focus control from media/ to content/ and make it per WebContents.

content/browser/media/android/media_session_delegate.h

+// Copyright 2015 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_BROWSER_MEDIA_ANDROID_MEDIA_SESSION_DELEGATE_H_
+#define CONTENT_BROWSER_MEDIA_ANDROID_MEDIA_SESSION_DELEGATE_H_
+
+#include <jni.h>
+
+#include "base/android/scoped_java_ref.h"
+#include "base/id_map.h"

[whywhat, 2015/05/12 12:50:46]

nit: IWYU - I don't think you need any of those includes here.

[mlamouri (slow - plz ping), 2015/05/19 21:56:16]

Oups :)

+#include "content/public/browser/web_contents_observer.h"
+#include "content/public/browser/web_contents_user_data.h"
+
+namespace content {
+
+class MediaSessionDelegate {
+ public:
+  MediaSessionDelegate() = default;
+  virtual ~MediaSessionDelegate() = default;
+
+  // The given |player_id| has been suspended by the MediaSession.
+  virtual void OnSuspend(int player_id) = 0;
+
+  // The given |player_id| has been suspended by the MediaSession.

[whywhat, 2015/05/12 12:50:46]

nit: s/suspended/resumed

[mlamouri (slow - plz ping), 2015/05/19 21:56:17]

Done.

+  virtual void OnResume(int player_id) = 0;
+};
+
+}  // namespace content
+
+#endif // CONTENT_BROWSER_MEDIA_ANDROID_MEDIA_SESSION_DELEGATE_H_