AudioOutputDevice authorization timeout UMA histograms

media/audio/audio_output_device.h

 // 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.
 //
 // Audio rendering unit utilizing audio output stream provided by browser
 // process through IPC.
 //
 // Relationship of classes.
 //
 //  AudioOutputController                AudioOutputDevice
@@ skipping 51 matching lines @@
 #ifndef MEDIA_AUDIO_AUDIO_OUTPUT_DEVICE_H_
 #define MEDIA_AUDIO_AUDIO_OUTPUT_DEVICE_H_
 
 #include <memory>
 #include <string>
 
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/memory/shared_memory.h"
 #include "base/synchronization/waitable_event.h"
+#include "base/time/time.h"
 #include "media/audio/audio_device_thread.h"
 #include "media/audio/audio_output_ipc.h"
 #include "media/audio/scoped_task_runner_observer.h"
 #include "media/base/audio_parameters.h"
 #include "media/base/audio_renderer_sink.h"
 #include "media/base/media_export.h"
 #include "media/base/output_device_info.h"
 
 namespace base {
+class ElapsedTimer;
 class OneShotTimer;
 }
 
 namespace media {
 
 class MEDIA_EXPORT AudioOutputDevice
     : NON_EXPORTED_BASE(public AudioRendererSink),
       NON_EXPORTED_BASE(public AudioOutputIPCDelegate),
       NON_EXPORTED_BASE(public ScopedTaskRunnerObserver) {
  public:
@@ skipping 119 matching lines @@
   // the callback via Start(). See http://crbug.com/151051 for details.
   bool stopping_hack_;
 
   base::WaitableEvent did_receive_auth_;
   AudioParameters output_params_;
   OutputDeviceStatus device_status_;
 
   const base::TimeDelta auth_timeout_;
   std::unique_ptr<base::OneShotTimer> auth_timeout_action_;
 
+  // Tracks how long it takes to get authorization response.
+  std::unique_ptr<base::ElapsedTimer> auth_timer_;
+
   DISALLOW_COPY_AND_ASSIGN(AudioOutputDevice);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_OUTPUT_DEVICE_H_