Adds Media.Audio.InputStartWasDeferredAudioWorkedMac UMA stat

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 <mach/mach.h>
 #include <string>
 
 #include "base/logging.h"
@@ skipping 519 matching lines @@
   DVLOG(1) << "Close";
   // It is valid to call Close() before calling open or Start().
   // It is also valid to call Close() after Start() has been called.
   if (IsRunning()) {
     Stop();
   }
   // Uninitialize and dispose the audio unit.
   CloseAudioUnit();
   // Disable the listener for device property changes.
   DeRegisterDeviceChangeListener();
-  // Check if any device property changes are added by filtering out a selected
-  // set of the |device_property_changes_map_| map. Add UMA stats if valuable
-  // data is found.
-  AddDevicePropertyChangesToUMA(false);
+  // Add more UMA stats but only if AGC was activated, i.e. for e.g. WebRTC
+  // audio input streams.
+  if (GetAutomaticGainControl()) {
+    // Check if any device property changes are added by filtering out a
+    // selected set of the |device_property_changes_map_| map. Add UMA stats
+    // if valuable data is found.
+    AddDevicePropertyChangesToUMA(false);
+    // Log if call to Start() was deferred or not. To be compared with

[Ilya Sherman, 2016/03/02 22:57:24]

nit: s/Log if ... or not/Log whether ...

[henrika (OOO until Aug 14), 2016/03/03 09:44:39]

Done.

+    // Media.Audio.InputStartWasDeferredMac which logs the same value but only
+    // when input audio fail to start.

[Ilya Sherman, 2016/03/02 22:57:24]

nit: s/fail/fails

[henrika (OOO until Aug 14), 2016/03/03 09:44:39]

Done.

+    UMA_HISTOGRAM_BOOLEAN("Media.Audio.InputStartWasDeferredAudioWorkedMac",
+                          start_was_deferred_);
+    // Log if a change of I/O buffer size was required. To be compared with
+    // Media.Audio.InputBufferSizeWasChangedMac which logs the same value but
+    // only when input audio fail to start.
+    UMA_HISTOGRAM_BOOLEAN("Media.Audio.InputBufferSizeWasChangedAudioWorkedMac",
+                          buffer_size_was_changed_);
+    // TODO(henrika): possibly add more values here...
+  }
   // Inform the audio manager that we have been closed. This will cause our
   // destruction.
   manager_->ReleaseInputStream(this);
 }
 
 double AUAudioInputStream::GetMaxVolume() {
   // Verify that we have a valid device.
   if (input_device_id_ == kAudioObjectUnknown) {
     NOTREACHED() << "Device ID is unknown";
     return 0.0;
@@ skipping 674 matching lines @@
     }
     DVLOG(1) << "property: " << device_property << " ("
              << FourCharFormatCodeToString(device_property) << ")"
              << " changed: " << change_count;
     LogDevicePropertyChange(startup_failed, uma_result);
   }
   device_property_changes_map_.clear();
 }
 
 }  // namespace media