media: Pass SetCdmReadyCB in {Audio|Video}Decoder::Initialize().

media/base/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_BASE_VIDEO_DECODER_H_
 #define MEDIA_BASE_VIDEO_DECODER_H_
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
+#include "media/base/cdm_context.h"
 #include "media/base/media_export.h"
 #include "media/base/pipeline_status.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace media {
 
 class DecoderBuffer;
 class VideoDecoderConfig;
 class VideoFrame;
 
@@ skipping 34 matching lines @@
   // Initializes a VideoDecoder with the given |config|, executing the
   // |init_cb| upon completion. |output_cb| is called for each output frame
   // decoded by Decode().
   //
   // If |low_delay| is true then the decoder is not allowed to queue frames,
   // except for out-of-order frames, i.e. if the next frame can be returned it
   // must be returned without waiting for Decode() to be called again.
   // Initialization should fail if |low_delay| is true and the decoder cannot
   // satisfy the requirements above.
   //
+  // |set_cdm_ready_cb| can be used to set/cancel a CdmReadyCB with which the
+  // decoder can be notified when a CDM is ready. The decoder can use the CDM to
+  // handle encrypted video stream.
+  //
   // Note:
   // 1) The VideoDecoder will be reinitialized if it was initialized before.
   //    Upon reinitialization, all internal buffered frames will be dropped.
   // 2) This method should not be called during pending decode or reset.
   // 3) No VideoDecoder calls should be made before |init_cb| is executed.
   virtual void Initialize(const VideoDecoderConfig& config,
                           bool low_delay,
+                          const SetCdmReadyCB& set_cdm_ready_cb,
                           const InitCB& init_cb,
                           const OutputCB& output_cb) = 0;
 
   // Requests a |buffer| to be decoded. The status of the decoder and decoded
   // frame are returned via the provided callback. Some decoders may allow
   // decoding multiple buffers in parallel. Callers should call
   // GetMaxDecodeRequests() to get number of buffers that may be decoded in
   // parallel. Decoder must call |decode_cb| in the same order in which Decode()
   // is called.
   //
@@ skipping 31 matching lines @@
   // Returns maximum number of parallel decode requests.
   virtual int GetMaxDecodeRequests() const;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(VideoDecoder);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_VIDEO_DECODER_H_