Store reverse output rate and number of channels in APM protobuf recordings

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;
   optional int32 num_output_channels = 4;
   optional int32 num_reverse_channels = 5;
   optional int32 reverse_sample_rate = 6;
   optional int32 output_sample_rate = 7;
+  optional int32 reverse_output_sample_rate = 8;
+  optional int32 num_reverse_output_channels = 9;
 }
 
 // May contain interleaved or deinterleaved data, but don't store both formats.
 message ReverseStream {
   // int16 interleaved data.
   optional bytes data = 1;
 
   // float deinterleaved data, where each repeated element points to a single
   // channel buffer of data.
   repeated bytes channel = 2;
@@ skipping 53 matching lines @@
     UNKNOWN_EVENT = 4;
   }
 
   required Type type = 1;
 
   optional Init init = 2;
   optional ReverseStream reverse_stream = 3;
   optional Stream stream = 4;
   optional Config config = 5;
 }