Integrate Intelligibility with APM

webrtc/modules/audio_processing/intelligibility/intelligibility_utils.h

Index: webrtc/modules/audio_processing/intelligibility/intelligibility_utils.h
diff --git a/webrtc/modules/audio_processing/intelligibility/intelligibility_utils.h b/webrtc/modules/audio_processing/intelligibility/intelligibility_utils.h
index 9908ac0456f1974f263a42e33a5124f5a3f9c33a..2d901e4ba09f69d2522248e44916484484d70f45 100644
--- a/webrtc/modules/audio_processing/intelligibility/intelligibility_utils.h
+++ b/webrtc/modules/audio_processing/intelligibility/intelligibility_utils.h
@@ -147,6 +147,12 @@ class GainApplier {
   void Apply(const std::complex<float>* in_block,
              std::complex<float>* out_block);
 
+  // Resets all target gain factors to 1.
+  void Clear();
+
+  // Returns true if all current and target gain factors are 1.
+  bool IsIdentity();
+
   // Return the current target gain set. Modify this array to set the targets.
   float* target() const { return target_.get(); }