Adding Media.InputStreamDuration to UMA histograms for low-latency input audio streams

media/audio/audio_input_controller.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.
 
 #ifndef MEDIA_AUDIO_AUDIO_INPUT_CONTROLLER_H_
 #define MEDIA_AUDIO_AUDIO_INPUT_CONTROLLER_H_
 
 #include <string>
 #include "base/atomicops.h"
 #include "base/callback.h"
@@ skipping 351 matching lines @@
 
   // Whether the silence state should sent as UMA stat.
   bool log_silence_state_;
 
   // The silence report sent as UMA stat at the end of a session.
   SilenceState silence_state_;
 #endif
 
   size_t prev_key_down_count_;
 
+  // Time when a low-latency stream is created.
+  base::TimeTicks low_latency_create_time_;
+
   DISALLOW_COPY_AND_ASSIGN(AudioInputController);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_INPUT_CONTROLLER_H_