Track stats for errors in AUAudioInputStream.

media/audio/mac/audio_low_latency_input_mac.cc

 // Copyright (c) 2012 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.
 
 #include "media/audio/mac/audio_low_latency_input_mac.h"
 
 #include <CoreServices/CoreServices.h>
 
 #include "base/logging.h"
 #include "base/mac/mac_logging.h"
@@ skipping 757 matching lines @@
       input_device_id_, &property_address, 0, nullptr, &size, &stream_format);
   if (result != noErr) {
     DLOG(WARNING) << "Could not get stream format";
     return 0;
   }
 
   return static_cast<int>(stream_format.mChannelsPerFrame);
 }
 
 void AUAudioInputStream::HandleError(OSStatus err) {
+  UMA_HISTOGRAM_SPARSE_SLOWLY("Media.InputErrorMac", err);
   NOTREACHED() << "error " << GetMacOSStatusErrorString(err)
                << " (" << err << ")";
   if (sink_)
     sink_->OnError(this);
 }
 
 bool AUAudioInputStream::IsVolumeSettableOnChannel(int channel) {
   Boolean is_settable = false;
   AudioObjectPropertyAddress property_address = {
     kAudioDevicePropertyVolumeScalar,
@@ skipping 60 matching lines @@
                             manager_->low_latency_input_streams());
   UMA_HISTOGRAM_COUNTS_1000("Media.Audio.NumberOfBasicInputStreamsMac",
                             manager_->basic_input_streams());
   // TODO(henrika): this value will currently always report true. It should be
   // fixed when we understand the problem better.
   UMA_HISTOGRAM_BOOLEAN("Media.Audio.AutomaticGainControlMac",
                         GetAutomaticGainControl());
 }
 
 }  // namespace media