Added a protobuf field for the audio processing module to store the status of experiments

webrtc/modules/audio_processing/echo_cancellation_impl.h

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 29 matching lines @@
   bool is_drift_compensation_enabled() const override;
 
   void Initialize(int sample_rate_hz,
                   size_t num_reverse_channels_,
                   size_t num_output_channels_,
                   size_t num_proc_channels_);
   void SetExtraOptions(const Config& config);
   bool is_delay_agnostic_enabled() const;
   bool is_extended_filter_enabled() const;
   bool is_aec3_enabled() const;
+  std::string GetExperimentsDescription();
 
   // Checks whether the module is enabled. Must only be
   // called from the render side of APM as otherwise
   // deadlocks may occur.
   bool is_enabled_render_side_query() const;
 
   // Reads render side data that has been queued on the render call.
   // Called holding the capture lock.
   void ReadQueuedRenderData();
 
@@ skipping 53 matching lines @@
 
   std::vector<std::unique_ptr<Canceller>> cancellers_;
   std::unique_ptr<StreamProperties> stream_properties_;
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(EchoCancellationImpl);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_ECHO_CANCELLATION_IMPL_H_