Added histogram for the output level int the audio processing module

webrtc/modules/audio_processing/audio_processing_impl.h

Index: webrtc/modules/audio_processing/audio_processing_impl.h
diff --git a/webrtc/modules/audio_processing/audio_processing_impl.h b/webrtc/modules/audio_processing/audio_processing_impl.h
index 4db2272c81c1c195343fa39e068f0e8732da19ab..e720cbd356e6664ce543e536cc21b11a5d8c0fb9 100644
--- a/webrtc/modules/audio_processing/audio_processing_impl.h
+++ b/webrtc/modules/audio_processing/audio_processing_impl.h
@@ -407,8 +407,9 @@ class AudioProcessingImpl : public AudioProcessing {
   std::vector<float> red_render_queue_buffer_ GUARDED_BY(crit_render_);
   std::vector<float> red_capture_queue_buffer_ GUARDED_BY(crit_capture_);
 
-  RmsLevel rms_ GUARDED_BY(crit_capture_);
-  int rms_interval_counter_ GUARDED_BY(crit_capture_) = 0;
+  RmsLevel capture_input_rms_ GUARDED_BY(crit_capture_);
+  RmsLevel capture_output_rms_ GUARDED_BY(crit_capture_);
+  int capture_rms_interval_counter_ GUARDED_BY(crit_capture_) = 0;
 
   // Lock protection not needed.
   std::unique_ptr<SwapQueue<std::vector<float>, RenderQueueItemVerifier<float>>>