[media_stream_audio_processor] Avoids updating UMA stats before AEC has valid results

content/renderer/media/media_stream_audio_processor_options.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_PROCESSOR_OPTIONS_H_
 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_PROCESSOR_OPTIONS_H_
 
 #include <string>
 
 #include "base/files/file.h"
@@ skipping 83 matching lines @@
  public:
   EchoInformation();
   virtual ~EchoInformation();
 
   void UpdateAecDelayStats(webrtc::EchoCancellation* echo_cancellation);
 
  private:
   // Counter to track 5 seconds of processed 10 ms chunks in order to query a
   // new metric from webrtc::EchoCancellation::GetEchoDelayMetrics().
   int num_chunks_;
+  bool echo_frames_received_;
 
   DISALLOW_COPY_AND_ASSIGN(EchoInformation);
 };
 
 // Enables the echo cancellation in |audio_processing|.
 void EnableEchoCancellation(AudioProcessing* audio_processing);
 
 // Enables the noise suppression in |audio_processing|.
 void EnableNoiseSuppression(AudioProcessing* audio_processing);
 
@@ skipping 14 matching lines @@
 void StopEchoCancellationDump(AudioProcessing* audio_processing);
 
 void EnableAutomaticGainControl(AudioProcessing* audio_processing);
 
 void GetAecStats(webrtc::EchoCancellation* echo_cancellation,
                  webrtc::AudioProcessorInterface::AudioProcessorStats* stats);
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_PROCESSOR_OPTIONS_H_