Revert 290359 "Remove AudioBuffersState class."

trunk/src/media/audio/alsa/alsa_output.cc

Index: trunk/src/media/audio/alsa/alsa_output.cc
===================================================================
--- trunk/src/media/audio/alsa/alsa_output.cc	(revision 290374)
+++ trunk/src/media/audio/alsa/alsa_output.cc	(working copy)
@@ -360,7 +360,7 @@
     scoped_refptr<media::DataBuffer> packet =
         new media::DataBuffer(packet_size_);
     int frames_filled = RunDataCallback(
-        audio_bus_.get(), hardware_delay);
+        audio_bus_.get(), AudioBuffersState(0, hardware_delay));
 
     size_t packet_size = frames_filled * bytes_per_frame_;
     DCHECK_LE(packet_size, packet_size_);
@@ -740,11 +740,11 @@
 }
 
 int AlsaPcmOutputStream::RunDataCallback(AudioBus* audio_bus,
-                                         int total_bytes_delay) {
+                                         AudioBuffersState buffers_state) {
   TRACE_EVENT0("audio", "AlsaPcmOutputStream::RunDataCallback");
 
   if (source_callback_)
-    return source_callback_->OnMoreData(audio_bus, total_bytes_delay);
+    return source_callback_->OnMoreData(audio_bus, buffers_state);
 
   return 0;
 }