Updating APM unittests on the echo metrics.

webrtc/modules/audio_processing/test/unittest.proto

 syntax = "proto2";
 option optimize_for = LITE_RUNTIME;
 package webrtc.audioproc;
 
 message Test {
   optional int32 num_reverse_channels = 1;
   optional int32 num_input_channels = 2;
   optional int32 num_output_channels = 3;
   optional int32 sample_rate = 4;
 
@@ skipping 14 matching lines @@
     optional int32 average = 2;
     optional int32 maximum = 3;
     optional int32 minimum = 4;
   }
 
   message EchoMetrics {
     optional Statistic residual_echo_return_loss = 1;
     optional Statistic echo_return_loss = 2;
     optional Statistic echo_return_loss_enhancement = 3;
     optional Statistic a_nlp = 4;
+    optional float divergent_filter_fraction = 5;
   }
 
-  optional EchoMetrics echo_metrics = 11;
+  repeated EchoMetrics echo_metrics = 11;
 
   message DelayMetrics {
     optional int32 median = 1;
     optional int32 std = 2;
     optional float fraction_poor_delays = 3;
   }
 
-  optional DelayMetrics delay_metrics = 12;
+  repeated DelayMetrics delay_metrics = 12;
 
-  optional int32 rms_level = 13;
+  repeated int32 rms_level = 13;
 
   optional float ns_speech_probability_average = 14;
 
   optional bool use_aec_extended_filter = 15;
 }
 
 message OutputData {
   repeated Test test = 1;
 }