content/renderer/media/: Change when to populate WebRTC.AecDelayBasedQuality

Previously the WebRTC.AecDelayBasedQuality histogram was populated even when the call to fetch the metrics from WebRTC failed. This CL makes sure we only populate upon success.

BUG=450193

Review URL: https://codereview.chromium.org/999203003

Cr-Commit-Position: refs/heads/master@{#322556}

content/renderer/media/media_stream_audio_processor_options.cc

@@ -249,12 +249,13 @@ void EchoInformation::UpdateAecDelayStats(
           &dummy_median, &dummy_std, &fraction_poor_delays) ==
       webrtc::AudioProcessing::kNoError) {
     num_chunks_ = 0;
+    // Map |fraction_poor_delays| to an Echo Cancellation quality and log in UMA
+    // histogram. See DelayBasedEchoQuality for information on histogram
+    // buckets.
+    UMA_HISTOGRAM_ENUMERATION("WebRTC.AecDelayBasedQuality",
+                              EchoDelayFrequencyToQuality(fraction_poor_delays),
+                              DELAY_BASED_ECHO_QUALITY_MAX);
   }
-  // Map |fraction_poor_delays| to an Echo Cancellation quality and log in UMA
-  // histogram. See DelayBasedEchoQuality for information on histogram buckets.
-  UMA_HISTOGRAM_ENUMERATION("WebRTC.AecDelayBasedQuality",
-                            EchoDelayFrequencyToQuality(fraction_poor_delays),
-                            DELAY_BASED_ECHO_QUALITY_MAX);
 }
 
 void EnableEchoCancellation(AudioProcessing* audio_processing) {