media: Support creation and SetCdm() for mojo based CDM.

media/mojo/services/mojo_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_CDM_DEFAULT_CDM_FACTORY_H_
-#define MEDIA_CDM_DEFAULT_CDM_FACTORY_H_
+#ifndef MEDIA_MOJO_SERVICES_MOJO_CDM_FACTORY_H_
+#define MEDIA_MOJO_SERVICES_MOJO_CDM_FACTORY_H_
 
 #include "base/macros.h"
 #include "media/base/cdm_factory.h"
+#include "media/mojo/interfaces/content_decryption_module_factory.mojom.h"
 
 namespace media {
 
-class DefaultCdmFactory : public CdmFactory {
+class MojoCdmFactory : public CdmFactory {
  public:
-  DefaultCdmFactory();
-  ~DefaultCdmFactory() final;
+  explicit MojoCdmFactory(
+      mojo::ContentDecryptionModuleFactoryPtr remote_factory);
+  ~MojoCdmFactory() final;
 
   // CdmFactory implementation.
   scoped_ptr<MediaKeys> Create(
       const std::string& key_system,
       bool allow_distinctive_identifier,
       bool allow_persistent_state,
       const GURL& security_origin,
       const SessionMessageCB& session_message_cb,
       const SessionClosedCB& session_closed_cb,
       const SessionErrorCB& session_error_cb,
       const SessionKeysChangeCB& session_keys_change_cb,
       const SessionExpirationUpdateCB& session_expiration_update_cb) final;
 
  private:
-  DISALLOW_COPY_AND_ASSIGN(DefaultCdmFactory);
+  // The next CDM ID for the current process.
+  static int next_cdm_id_;
+
+  mojo::ContentDecryptionModuleFactoryPtr remote_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(MojoCdmFactory);
 };
 
 }  // namespace media
 
-#endif  // MEDIA_CDM_DEFAULT_CDM_FACTORY_H_
+#endif  // MEDIA_MOJO_SERVICES_MOJO_CDM_FACTORY_H_