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

webrtc/modules/audio_processing/echo_cancellation_impl.cc

 /*
  *  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 395 matching lines @@
 bool EchoCancellationImpl::is_delay_agnostic_enabled() const {
   rtc::CritScope cs(crit_capture_);
   return delay_agnostic_enabled_;
 }
 
 bool EchoCancellationImpl::is_aec3_enabled() const {
   rtc::CritScope cs(crit_capture_);
   return aec3_enabled_;
 }
 
+std::string EchoCancellationImpl::GetExperimentsDescription() {
+  rtc::CritScope cs(crit_capture_);
+  if (aec3_enabled_) {

[hlundin-webrtc, 2016/04/14 07:50:07]

return aec3_enabled_ ? "AEC3" : "";

[peah-webrtc, 2016/04/14 11:11:06]

Done.

+    return "AEC3";
+  }
+  return "";
+}
+
 bool EchoCancellationImpl::is_extended_filter_enabled() const {
   rtc::CritScope cs(crit_capture_);
   return extended_filter_enabled_;
 }
 
 // TODO(bjornv): How should we handle the multi-channel case?
 int EchoCancellationImpl::GetDelayMetrics(int* median, int* std) {
   rtc::CritScope cs(crit_capture_);
   float fraction_poor_delays = 0;
   return GetDelayMetrics(median, std, &fraction_poor_delays);
@@ skipping 133 matching lines @@
   return error;
 }
 
 size_t EchoCancellationImpl::NumCancellersRequired() const {
   RTC_DCHECK(stream_properties_);
   return stream_properties_->num_output_channels *
          stream_properties_->num_reverse_channels;
 }
 
 }  // namespace webrtc