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

webrtc/modules/audio_processing/debug.proto

 syntax = "proto2";
 option optimize_for = LITE_RUNTIME;
 package webrtc.audioproc;
 
 // Contains the format of input/output/reverse audio. An Init message is added
 // when any of the fields are changed.
 message Init {
   optional int32 sample_rate = 1;
   optional int32 device_sample_rate = 2 [deprecated=true];
   optional int32 num_input_channels = 3;
@@ skipping 28 matching lines @@
 
   // float deinterleaved data, where each repeated element points to a single
   // channel buffer of data.
   repeated bytes input_channel = 7;
   repeated bytes output_channel = 8;
 }
 
 // Contains the configurations of various APM component. A Config message is
 // added when any of the fields are changed.
 message Config {
-  // Next field number 17.
+  // Next field number 18.
   // Acoustic echo canceler.
   optional bool aec_enabled = 1;
   optional bool aec_delay_agnostic_enabled = 2;
   optional bool aec_drift_compensation_enabled = 3;
   optional bool aec_extended_filter_enabled = 4;
   optional int32 aec_suppression_level = 5;
   // Mobile AEC.
   optional bool aecm_enabled = 6;
   optional bool aecm_comfort_noise_enabled = 7;
   optional int32 aecm_routing_mode = 8;
   // Automatic gain controller.
   optional bool agc_enabled = 9;
   optional int32 agc_mode = 10;
   optional bool agc_limiter_enabled = 11;
   optional bool noise_robust_agc_enabled = 12;
   // High pass filter.
   optional bool hpf_enabled = 13;
   // Noise suppression.
   optional bool ns_enabled = 14;
   optional int32 ns_level = 15;
   // Transient suppression.
   optional bool transient_suppression_enabled = 16;
+  // Semicolon separated string containing experimental feature

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

"Semicolon-separated"

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

Done.

+  // descriptions.
+  optional string experiments_description = 17;
 }
 
 message Event {
   enum Type {
     INIT = 0;
     REVERSE_STREAM = 1;
     STREAM = 2;
     CONFIG = 3;
     UNKNOWN_EVENT = 4;
   }
 
   required Type type = 1;
 
   optional Init init = 2;
   optional ReverseStream reverse_stream = 3;
   optional Stream stream = 4;
   optional Config config = 5;
 }