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

webrtc/modules/audio_processing/audio_processing_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 1421 matching lines @@
 
   config.set_hpf_enabled(public_submodules_->high_pass_filter->is_enabled());
 
   config.set_ns_enabled(public_submodules_->noise_suppression->is_enabled());
   config.set_ns_level(
       static_cast<int>(public_submodules_->noise_suppression->level()));
 
   config.set_transient_suppression_enabled(
       capture_.transient_suppressor_enabled);
 
+  std::string experiments_description = "";
+  experiments_description +=

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

You don't have to define the string empty first, and then append to it. Simply
do
std::string experiments_description =
public_submodules_->echo_cancellation->GetExperimentsDescription();

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

Done.

+      public_submodules_->echo_cancellation->GetExperimentsDescription();
+  // TODO(peah): Add semicolon separated concatenations of experiment

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

Language nit: "semicolon-separated" (with a hyphen).
Cf. https://en.wikipedia.org/wiki/Comma-separated_values

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

Done.

+  // descriptions for other submodules.
+  config.set_experiments_description(experiments_description);
+
   std::string serialized_config = config.SerializeAsString();
   if (!forced &&
       debug_dump_.capture.last_serialized_config == serialized_config) {
     return kNoError;
   }
 
   debug_dump_.capture.last_serialized_config = serialized_config;
 
   debug_dump_.capture.event_msg->set_type(audioproc::Event::CONFIG);
   debug_dump_.capture.event_msg->mutable_config()->CopyFrom(config);
 
   RETURN_ON_ERR(WriteMessageToDebugFile(debug_dump_.debug_file.get(),
                                         &debug_dump_.num_bytes_left_for_log_,
                                         &crit_debug_, &debug_dump_.capture));
   return kNoError;
 }
 #endif  // WEBRTC_AUDIOPROC_DEBUG_DUMP
 
 }  // namespace webrtc