Implements the GetSignalLevel and GetStats interface for the local audio track.

content/renderer/media/media_stream_audio_processor_options.h

Index: content/renderer/media/media_stream_audio_processor_options.h
diff --git a/content/renderer/media/media_stream_audio_processor_options.h b/content/renderer/media/media_stream_audio_processor_options.h
index 3977000d1d3ee9a164d3d3bd5e65103e60edf38c..41da49d1a9bf0d05756696aac5d7201a26adb9f6 100644
--- a/content/renderer/media/media_stream_audio_processor_options.h
+++ b/content/renderer/media/media_stream_audio_processor_options.h
@@ -7,6 +7,8 @@
 
 #include <string>
 
+#include "third_party/libjingle/source/talk/app/webrtc/mediastreaminterface.h"
+
 namespace blink {
 class WebMediaConstraints;
 }
@@ -72,6 +74,9 @@ void StopAecDump(AudioProcessing* audio_processing);
 
 void EnableAutomaticGainControl(AudioProcessing* audio_processing);
 
+void GetAecStats(AudioProcessing* audio_processing,
+                 webrtc::AudioProcessorInterface::AudioProcessorStats* stats);
+
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_PROCESSOR_OPTIONS_H_