Make GetConfig() part of the AudioProcessing interface

webrtc/modules/audio_processing/include/audio_processing.h

Index: webrtc/modules/audio_processing/include/audio_processing.h
diff --git a/webrtc/modules/audio_processing/include/audio_processing.h b/webrtc/modules/audio_processing/include/audio_processing.h
index ab924b75343e5d9c086e6a689ca7726b6e830c3d..99e4b690ff52680a8226ed872c825d207f9d2901 100644
--- a/webrtc/modules/audio_processing/include/audio_processing.h
+++ b/webrtc/modules/audio_processing/include/audio_processing.h
@@ -559,6 +559,11 @@ class AudioProcessing {
   virtual NoiseSuppression* noise_suppression() const = 0;
   virtual VoiceDetection* voice_detection() const = 0;
 
+  // Returns the last applied configuration.
+  // TODO(henrik.lundin) Make this method pure virtual when downstream
+  // dependencies have been fixed.
+  virtual AudioProcessing::Config GetConfig() const;
+
   enum Error {
     // Fatal errors.
     kNoError = 0,