Let Flash join and be controlled by media session

content/browser/media/session/pepper_player_delegate.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_BROWSER_MEDIA_SESSION_PEPPER_PLAYER_DELEGATE_H_
+#define CONTENT_BROWSER_MEDIA_SESSION_PEPPER_PLAYER_DELEGATE_H_
+
+#include "content/browser/media/session/media_session_observer.h"
+#include "ppapi/c/pp_instance.h"
+
+namespace content {
+
+class PepperWebContentsObserver;
+
+class PepperPlayerDelegate : public MediaSessionObserver {
+ public:
+  PepperPlayerDelegate(
+      PepperWebContentsObserver* pepper_web_contents_observer,
+      PP_Instance pp_instance);
+  ~PepperPlayerDelegate() override;
+
+  void OnSuspend(int player_id) override;

[jochen (gone - plz use gerrit), 2016/06/27 11:47:11]

add a comment like // MediaSessionObserver implementation.

[Zhiqiang Zhang (Slow), 2016/06/28 18:53:24]

Done.

+  void OnResume(int player_id) override;
+  void OnSetVolumeMultiplier(int player_id,
+                             double volume_multiplier) override;
+
+  void OnSetVolume(int player_id, double volume);

[jochen (gone - plz use gerrit), 2016/06/27 11:47:11]

this should be private and be named SetVolume

[Zhiqiang Zhang (Slow), 2016/06/28 18:53:24]

Done.

+
+ private:
+  PepperWebContentsObserver* pepper_web_contents_observer_;
+  PP_Instance pp_instance_;
+};

[jochen (gone - plz use gerrit), 2016/06/27 11:47:11]

disallow copy & assign

[Zhiqiang Zhang (Slow), 2016/06/28 18:53:24]

Done.

+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_MEDIA_SESSION_PEPPER_PLAYER_DELEGATE_H_