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

webrtc/modules/audio_processing/echo_cancellation_impl.cc

Index: webrtc/modules/audio_processing/echo_cancellation_impl.cc
diff --git a/webrtc/modules/audio_processing/echo_cancellation_impl.cc b/webrtc/modules/audio_processing/echo_cancellation_impl.cc
index 810ea8965542a146de325fc144376c98993dd6a0..4d9fb0a89232ba1c9b1d9f91b8888f2c81a7ae77 100644
--- a/webrtc/modules/audio_processing/echo_cancellation_impl.cc
+++ b/webrtc/modules/audio_processing/echo_cancellation_impl.cc
@@ -413,6 +413,14 @@ bool EchoCancellationImpl::is_aec3_enabled() const {
   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_;