Add FFmpeg audio decoder for the clear key CDM.

webkit/media/crypto/ppapi/ffmpeg_cdm_video_decoder.h

 // Copyright (c) 2012 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 WEBKIT_MEDIA_CRYPTO_PPAPI_FFMPEG_CDM_VIDEO_DECODER_H_
 #define WEBKIT_MEDIA_CRYPTO_PPAPI_FFMPEG_CDM_VIDEO_DECODER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "webkit/media/crypto/ppapi/content_decryption_module.h"
 
 struct AVCodecContext;
 struct AVFrame;
 
 namespace webkit_media {
 
 class FFmpegCdmVideoDecoder {
  public:
-  FFmpegCdmVideoDecoder(cdm::Allocator* allocator);
+  explicit FFmpegCdmVideoDecoder(cdm::Allocator* allocator);
   ~FFmpegCdmVideoDecoder();
   bool Initialize(const cdm::VideoDecoderConfig& config);
   void Deinitialize();
   void Reset();
 
   // Returns true when |format| and |data_size| specify a supported video
   // output configuration.
   static bool IsValidOutputConfig(cdm::VideoFormat format,
                                   const cdm::Size& data_size);
 
@@ skipping 20 matching lines @@
   bool is_initialized_;
 
   cdm::Allocator* const allocator_;
 
   DISALLOW_COPY_AND_ASSIGN(FFmpegCdmVideoDecoder);
 };
 
 }  // namespace webkit_media
 
 #endif  // WEBKIT_MEDIA_CRYPTO_PPAPI_FFMPEG_CDM_VIDEO_DECODER_H_