Introduce CdmFactory interface.

media/base/cdm_factory.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_CDM_FACTORY_H_
+#define MEDIA_BASE_CDM_FACTORY_H_
+
+#include <string>
+
+#include "base/memory/scoped_ptr.h"
+#include "media/base/media_export.h"
+#include "media/base/media_keys.h"
+
+class GURL;
+
+namespace media {
+
+class MEDIA_EXPORT CdmFactory {
+ public:
+  CdmFactory();
+  virtual ~CdmFactory();
+
+  virtual scoped_ptr<MediaKeys> Create(
+      const std::string& key_system,
+      const GURL& security_origin,
+#if defined(ENABLE_BROWSER_CDMS)
+      int* cdm_id,  // Output parameter indicating the CDM ID of the MediaKeys.
+#endif
+      const SessionMessageCB& session_message_cb,
+      const SessionReadyCB& session_ready_cb,
+      const SessionClosedCB& session_closed_cb,
+      const SessionErrorCB& session_error_cb,
+      const SessionKeysChangeCB& session_keys_change_cb,
+      const SessionExpirationUpdateCB& session_expiration_update_cb) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(CdmFactory);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_CDM_FACTORY_H_