media: Reland "Simplify {Audio|Video}Decoder initialization callback."

media/filters/decrypting_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 MEDIA_FILTERS_DECRYPTING_VIDEO_DECODER_H_
 #define MEDIA_FILTERS_DECRYPTING_VIDEO_DECODER_H_
 
 #include "base/callback.h"
 #include "base/memory/weak_ptr.h"
 #include "media/base/decryptor.h"
@@ skipping 18 matching lines @@
   DecryptingVideoDecoder(
       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
       const SetDecryptorReadyCB& set_decryptor_ready_cb,
       const base::Closure& waiting_for_decryption_key_cb);
   ~DecryptingVideoDecoder() override;
 
   // VideoDecoder implementation.
   std::string GetDisplayName() const override;
   void Initialize(const VideoDecoderConfig& config,
                   bool low_delay,
-                  const PipelineStatusCB& status_cb,
+                  const InitCB& init_cb,
                   const OutputCB& output_cb) override;
   void Decode(const scoped_refptr<DecoderBuffer>& buffer,
               const DecodeCB& decode_cb) override;
   void Reset(const base::Closure& closure) override;
 
   static const char kDecoderName[];
 
  private:
   // For a detailed state diagram please see this link: http://goo.gl/8jAok
   // TODO(xhwang): Add a ASCII state diagram in this file after this class
@@ skipping 28 matching lines @@
   // added.
   void OnKeyAdded();
 
   // Reset decoder and call |reset_cb_|.
   void DoReset();
 
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
 
   State state_;
 
-  PipelineStatusCB init_cb_;
+  InitCB init_cb_;
   OutputCB output_cb_;
   DecodeCB decode_cb_;
   base::Closure reset_cb_;
   base::Closure waiting_for_decryption_key_cb_;
 
   VideoDecoderConfig config_;
 
   // Callback to request/cancel decryptor creation notification.
   SetDecryptorReadyCB set_decryptor_ready_cb_;
 
@@ skipping 15 matching lines @@
 
   base::WeakPtr<DecryptingVideoDecoder> weak_this_;
   base::WeakPtrFactory<DecryptingVideoDecoder> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DecryptingVideoDecoder);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_DECRYPTING_VIDEO_DECODER_H_