Add PlayerTracker and BrowserCdm interfaces.

media/base/browser_cdm.h

+// Copyright 2014 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_BROWSER_CDM_H_
+#define MEDIA_BASE_BROWSER_CDM_H_
+
+#include "media/base/media_keys.h"
+#include "media/base/player_tracker.h"
+
+namespace media {
+
+// Interface for browser side CDMs.
+class BrowserCdm : public MediaKeys, public PlayerTracker {
+ public:
+  virtual ~BrowserCdm();
+
+  // MediaKeys implementation.
+  virtual bool CreateSession(uint32 session_id,
+                             const std::string& content_type,
+                             const uint8* init_data,
+                             int init_data_length) = 0;
+  virtual void LoadSession(uint32 session_id,
+                           const std::string& web_session_id) = 0;
+  virtual void UpdateSession(uint32 session_id,
+                             const uint8* response,
+                             int response_length) = 0;
+  virtual void ReleaseSession(uint32 session_id) = 0;
+
+  // PlayerTracker implementation.
+  virtual int RegisterPlayer(const base::Closure& new_key_cb,
+                             const base::Closure& cdm_unset_cb) = 0;
+  virtual void UnregisterPlayer(int registration_id) = 0;
+
+ protected:
+   BrowserCdm();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(BrowserCdm);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_BROWSER_CDM_H_