Use larger buffer sizes for lower power on Linux.

media/base/audio_hardware_config.h

Index: media/base/audio_hardware_config.h
diff --git a/media/base/audio_hardware_config.h b/media/base/audio_hardware_config.h
index d1621b98224bf6fcc3dcf4cea55d189d79d73d55..a4baaac097909be858f61533e0260ce92a5845bf 100644
--- a/media/base/audio_hardware_config.h
+++ b/media/base/audio_hardware_config.h
@@ -41,6 +41,10 @@ class MEDIA_EXPORT AudioHardwareConfig {
   void UpdateInputConfig(const media::AudioParameters& input_params);
   void UpdateOutputConfig(const media::AudioParameters& output_params);
 
+  // For clients which don't need low latency, a larger buffer size should be
+  // used to save power and CPU resources.
+  int GetHighLatencyBufferSize() const;
+
  private:
   // Cached values; access is protected by |config_lock_|.
   mutable base::Lock config_lock_;