Compensate for the LevelController gain in the IntelligibilityEnhancer

R=peah@webrtc.org

Review URL: https://codereview.webrtc.org/2112553003 .

Cr-Commit-Position: refs/heads/master@{#13353}
diff --git a/webrtc/modules/audio_processing/audio_processing_impl.cc b/webrtc/modules/audio_processing/audio_processing_impl.cc
index b0433ef..afeebba 100644
--- a/webrtc/modules/audio_processing/audio_processing_impl.cc
+++ b/webrtc/modules/audio_processing/audio_processing_impl.cc
@@ -728,8 +728,12 @@
     int gain_db = public_submodules_->gain_control->is_enabled() ?
                   public_submodules_->gain_control->compression_gain_db() :
                   0;
+    float gain = std::pow(10.f, gain_db / 20.f);
+    gain *= capture_nonlocked_.level_controller_enabled ?
+            private_submodules_->level_controller->GetLastGain() :
+            1.f;
     public_submodules_->intelligibility_enhancer->SetCaptureNoiseEstimate(
-        public_submodules_->noise_suppression->NoiseEstimate(), gain_db);
+        public_submodules_->noise_suppression->NoiseEstimate(), gain);
   }
 
   // Ensure that the stream delay was set before the call to the