Surface the noise estimate of the NS to be used by other components

webrtc/modules/audio_processing/noise_suppression_impl.h

Index: webrtc/modules/audio_processing/noise_suppression_impl.h
diff --git a/webrtc/modules/audio_processing/noise_suppression_impl.h b/webrtc/modules/audio_processing/noise_suppression_impl.h
index debbc61bc95c4b724b2e73c37c95b3e6799c34c3..14b07357452d201583d7fec5c2a0f54e33215809 100644
--- a/webrtc/modules/audio_processing/noise_suppression_impl.h
+++ b/webrtc/modules/audio_processing/noise_suppression_impl.h
@@ -11,6 +11,8 @@
 #ifndef WEBRTC_MODULES_AUDIO_PROCESSING_NOISE_SUPPRESSION_IMPL_H_
 #define WEBRTC_MODULES_AUDIO_PROCESSING_NOISE_SUPPRESSION_IMPL_H_
 
+#include <vector>
+
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/base/criticalsection.h"
 #include "webrtc/base/scoped_ptr.h"
@@ -36,6 +38,7 @@ class NoiseSuppressionImpl : public NoiseSuppression {
   int set_level(Level level) override;
   Level level() const override;
   float speech_probability() const override;
+  const std::vector<float>& noise_estimate() override;
 
  private:
   class Suppressor;
@@ -45,6 +48,8 @@ class NoiseSuppressionImpl : public NoiseSuppression {
   size_t channels_ GUARDED_BY(crit_) = 0;
   int sample_rate_hz_ GUARDED_BY(crit_) = 0;
   std::vector<rtc::scoped_ptr<Suppressor>> suppressors_ GUARDED_BY(crit_);
+  std::vector<float> noise_estimate_ GUARDED_BY(crit_);
+  bool noise_estimate_updated_ GUARDED_BY(crit_);
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(NoiseSuppressionImpl);
 };
 }  // namespace webrtc