Revert 290359 "Remove AudioBuffersState class."

trunk/src/media/audio/win/audio_low_latency_output_win.cc

Index: trunk/src/media/audio/win/audio_low_latency_output_win.cc
===================================================================
--- trunk/src/media/audio/win/audio_low_latency_output_win.cc	(revision 290374)
+++ trunk/src/media/audio/win/audio_low_latency_output_win.cc	(working copy)
@@ -498,9 +498,13 @@
 
     // Read a data packet from the registered client source and
     // deliver a delay estimate in the same callback to the client.
+    // A time stamp is also stored in the AudioBuffersState. This
+    // time stamp can be used at the client side to compensate for
+    // the delay between the usage of the delay value and the time
+    // of generation.
 
     int frames_filled = source_->OnMoreData(
-        audio_bus_.get(), audio_delay_bytes);
+        audio_bus_.get(), AudioBuffersState(0, audio_delay_bytes));
     uint32 num_filled_bytes = frames_filled * format_.Format.nBlockAlign;
     DCHECK_LE(num_filled_bytes, packet_size_bytes_);