Revert 290359 "Remove AudioBuffersState class."

trunk/src/media/audio/cras/cras_unified.cc

 // 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.
 
 #include "media/audio/cras/cras_unified.h"
 
 #include "base/logging.h"
 #include "media/audio/cras/audio_manager_cras.h"
 
 namespace media {
@@ skipping 340 matching lines @@
   // of the first input sample and the playback time of the next audio sample
   // passed from the audio server, add them together for total latency.
   uint32 total_delay_bytes;
   timespec latency_ts  = {0, 0};
   cras_client_calc_capture_latency(input_ts, &latency_ts);
   total_delay_bytes = GetBytesLatency(latency_ts);
   cras_client_calc_playback_latency(output_ts, &latency_ts);
   total_delay_bytes += GetBytesLatency(latency_ts);
 
   int frames_filled = source_callback_->OnMoreData(
-      output_bus_.get(), total_delay_bytes);
+      output_bus_.get(),
+      AudioBuffersState(0, total_delay_bytes));
 
   output_bus_->ToInterleaved(frames_filled, bytes_per_sample, output_samples);
 
   return frames_filled;
 }
 
 uint32 CrasUnifiedStream::WriteAudio(size_t frames,
                                      uint8* buffer,
                                      const timespec* sample_ts) {
   DCHECK_EQ(frames, static_cast<size_t>(output_bus_->frames()));
 
   // Determine latency and pass that on to the source.
   timespec latency_ts  = {0, 0};
   cras_client_calc_playback_latency(sample_ts, &latency_ts);
 
   int frames_filled = source_callback_->OnMoreData(
-      output_bus_.get(), GetBytesLatency(latency_ts));
+      output_bus_.get(), AudioBuffersState(0, GetBytesLatency(latency_ts)));
 
   // Note: If this ever changes to output raw float the data must be clipped and
   // sanitized since it may come from an untrusted source such as NaCl.
   output_bus_->ToInterleaved(
       frames_filled, bytes_per_frame_ / params_.channels(), buffer);
 
   return frames_filled;
 }
 
 void CrasUnifiedStream::NotifyStreamError(int err) {
   // This will remove the stream from the client.
   if (source_callback_)
     source_callback_->OnError(this);
 }
 
 }  // namespace media