Introduce AudioOutputResampler for browser side resampling.

media/base/multi_channel_resampler.h

Index: media/base/multi_channel_resampler.h
diff --git a/media/base/multi_channel_resampler.h b/media/base/multi_channel_resampler.h
index 6d65075241df18d052a59158c850f843c6bbcbf8..6c2c2d8d3b21a69585db67defb53c928c25bc42f 100644
--- a/media/base/multi_channel_resampler.h
+++ b/media/base/multi_channel_resampler.h
@@ -34,7 +34,12 @@ class MEDIA_EXPORT MultiChannelResampler {
   // Resamples |frames| of data from |read_cb_| into AudioBus.
   void Resample(AudioBus* audio_bus, int frames);
 
+  // Flush all buffered data and reset internal indexes.

[scherkus (not reviewing), 2012/09/07 13:30:17]

s/indexes/indicies/

$ git grep -i "indexes" . | wc -l
     995
$ git grep -i "indices" . | wc -l
    2619

[DaleCurtis, 2012/09/10 12:06:24]

Done.

+  void Flush();
+
  private:
+  friend class MultiChannelResamplerTest;

[scherkus (not reviewing), 2012/09/07 13:30:17]

hrmm.. friend only for last_frame_count_?

I'd either just ignore having a test for that or if you really want to test it
provide a last_frame_count_for_test() method

[DaleCurtis, 2012/09/10 12:06:24]

Removed.

+
   // SincResampler::ReadCB implementation.  ProvideInput() will be called for
   // each channel (in channel order) as SincResampler needs more data.
   void ProvideInput(int channel, float* destination, int frames);