Adds support for 16kHz input sample rate and mono channel config. in WebRTC.

content/test/webrtc_audio_device_test.h

Index: content/test/webrtc_audio_device_test.h
diff --git a/content/test/webrtc_audio_device_test.h b/content/test/webrtc_audio_device_test.h
index f821ad61ed110d378e85bdcbbd144300d10327c6..d02ef2c532ed087a7d37bcc3ea6fc8736b807f9c 100644
--- a/content/test/webrtc_audio_device_test.h
+++ b/content/test/webrtc_audio_device_test.h
@@ -109,6 +109,7 @@ class AudioUtilInterface {
   virtual ~AudioUtilInterface() {}
   virtual double GetAudioHardwareSampleRate() = 0;
   virtual double GetAudioInputHardwareSampleRate() = 0;
+  virtual uint32 GetAudioInputHardwareChannelCount() = 0;
 };
 
 // Implemented and defined in the cc file.
@@ -137,6 +138,7 @@ class WebRTCAudioDeviceTest
 
   void OnGetHardwareSampleRate(double* sample_rate);
   void OnGetHardwareInputSampleRate(double* sample_rate);
+  void OnGetHardwareInputChannelCount(uint32* channels);
 
   // IPC::Channel::Listener implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;