Add support for midstream audio configuration changes.

media/base/audio_converter.h

Index: media/base/audio_converter.h
diff --git a/media/base/audio_converter.h b/media/base/audio_converter.h
index b921a3a186e47c96d52c1a9090384d6c69d476dc..6d441ce4f4ee333f4e1391f90720ef66a8a26e03 100644
--- a/media/base/audio_converter.h
+++ b/media/base/audio_converter.h
@@ -90,6 +90,9 @@ class MEDIA_EXPORT AudioConverter {
   // to each input's ProvideInput for more data.
   int ChunkSize() const;
 
+  // How many frames will be requested via a single ProvideInput() call.

[DaleCurtis, 2014/03/20 19:29:01]

You should be able to calculate this within your converter. Just don't set
disable_fifo == true.  It shouldn't be a performance issue since you won't
create a converter just for buffer size mismatches.

[rileya (GONE FROM CHROMIUM), 2014/03/21 20:58:49]

Good point, I'd previously disabled the fifo, but not doing so makes things
simpler... Removed this.

+  int RequestSize() const;
+
  private:
   // Provides input to the MultiChannelResampler.  Called by the resampler when
   // more data is necessary.
@@ -137,6 +140,8 @@ class MEDIA_EXPORT AudioConverter {
   // AudioBus structures on demand in response to varying frame size requests.
   const int input_channel_count_;
 
+  const double io_sample_rate_ratio_;
+
   DISALLOW_COPY_AND_ASSIGN(AudioConverter);
 };