Replace AudioDecoder::ProduceAudioSamples/ConsumeAudioSamples with read callbacks.

media/filters/audio_renderer_algorithm_base.h

Index: media/filters/audio_renderer_algorithm_base.h
diff --git a/media/filters/audio_renderer_algorithm_base.h b/media/filters/audio_renderer_algorithm_base.h
index c6888c26f71388a3913b5727c958aba4b379ce25..6ea8db59f7a060af8d68f243eb50fe890ff2429d 100644
--- a/media/filters/audio_renderer_algorithm_base.h
+++ b/media/filters/audio_renderer_algorithm_base.h
@@ -71,9 +71,14 @@ class MEDIA_EXPORT AudioRendererAlgorithmBase {
   // Returns true if we have enough data
   bool IsQueueFull();
 
-  // Returns the number of bytes left in |queue_|.
+  // Returns the number of bytes left in |queue_|, which may be larger than
+  // QueueCapacity() in the event that a read callback delivered more data than
+  // |queue_| was intending to hold.
   uint32 QueueSize();
 
+  // Returns the capacity of |queue_|.
+  uint32 QueueCapacity();
+
   // Increase the capacity of |queue_| if possible.
   void IncreaseQueueCapacity();