Update default values for APM stats to match old behavior.

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 1469 matching lines @@
 // TODO(ivoc): Remove this when GetStatistics() becomes pure virtual.
 AudioProcessing::AudioProcessingStatistics AudioProcessing::GetStatistics()
     const {
   return AudioProcessingStatistics();
 }
 
 AudioProcessing::AudioProcessingStatistics AudioProcessingImpl::GetStatistics()
     const {
   AudioProcessingStatistics stats;
   EchoCancellation::Metrics metrics;
-  public_submodules_->echo_cancellation->GetMetrics(&metrics);
-  stats.a_nlp.Set(metrics.a_nlp);
-  stats.divergent_filter_fraction = metrics.divergent_filter_fraction;
-  stats.echo_return_loss.Set(metrics.echo_return_loss);
-  stats.echo_return_loss_enhancement.Set(metrics.echo_return_loss_enhancement);
-  stats.residual_echo_return_loss.Set(metrics.residual_echo_return_loss);
+  int success = public_submodules_->echo_cancellation->GetMetrics(&metrics);
+  if (success == Error::kNoError) {
+    stats.a_nlp.Set(metrics.a_nlp);
+    stats.divergent_filter_fraction = metrics.divergent_filter_fraction;
+    stats.echo_return_loss.Set(metrics.echo_return_loss);
+    stats.echo_return_loss_enhancement.Set(
+        metrics.echo_return_loss_enhancement);
+    stats.residual_echo_return_loss.Set(metrics.residual_echo_return_loss);
+  }
   public_submodules_->echo_cancellation->GetDelayMetrics(
       &stats.delay_median, &stats.delay_standard_deviation,
       &stats.fraction_poor_delays);
   return stats;
 }
 
 EchoCancellation* AudioProcessingImpl::echo_cancellation() const {
   return public_submodules_->echo_cancellation.get();
 }
 
@@ skipping 314 matching lines @@
       capture_processing_format(kSampleRate16kHz),
       split_rate(kSampleRate16kHz) {}
 
 AudioProcessingImpl::ApmCaptureState::~ApmCaptureState() = default;
 
 AudioProcessingImpl::ApmRenderState::ApmRenderState() = default;
 
 AudioProcessingImpl::ApmRenderState::~ApmRenderState() = default;
 
 }  // namespace webrtc