Add CdmWrapper to support multiple CDM versions in CdmAdapter.

media/cdm/ppapi/cdm_adapter.h

 // Copyright 2013 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_PPAPI_CDM_ADAPTER_H_
 #define MEDIA_CDM_PPAPI_CDM_ADAPTER_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "media/cdm/ppapi/api/content_decryption_module.h"
 #include "media/cdm/ppapi/cdm_helpers.h"
+#include "media/cdm/ppapi/cdm_wrapper.h"
 #include "media/cdm/ppapi/linked_ptr.h"
 #include "ppapi/c/pp_stdint.h"
 #include "ppapi/c/private/pp_content_decryptor.h"
 #include "ppapi/cpp/completion_callback.h"
 #include "ppapi/cpp/private/content_decryptor_private.h"
 #include "ppapi/cpp/var.h"
 #include "ppapi/cpp/var_array_buffer.h"
 #include "ppapi/utility/completion_callback_factory.h"
 
 namespace media {
@@ skipping 122 matching lines @@
                       const LinkedAudioFrames& audio_frames,
                       const PP_DecryptTrackingInfo& tracking_info);
 
   // Helper for SetTimer().
   void TimerExpired(int32_t result, void* context);
 
   bool IsValidVideoFrame(const LinkedVideoFrame& video_frame);
 
   PpbBufferAllocator allocator_;
   pp::CompletionCallbackFactory<CdmAdapter> callback_factory_;
-  cdm::ContentDecryptionModule* cdm_;
+  linked_ptr<CdmWrapper> cdm_;
   std::string key_system_;
 
   DISALLOW_COPY_AND_ASSIGN(CdmAdapter);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_CDM_PPAPI_CDM_ADAPTER_H_