Contains fixes for a non-perfect implementation in https://codereview.webrtc.org/2328433003/
Summary:
Adds WebRTC.Audio.RecordedOnlyZeros UMA stat when recording stops if:
- All level estimates during the audio session were zero, and
- If the audio session was longer than 10 seconds.
Adds four simple methods to the AudioDeviceBuffer (ADB) class to allow the ADM
to update the ADB about when media starts and stops in both directions.
Moves any "critical" parst out frome the timer (based on task queue) and ensures
that it only does trivial logging tasks.
The task queue is now owned by a unique pointer to improve control of when it
starts and stops.
Adds time measurements (for logging) of both total time playing out and total
recording time. Units are in milliseconds.
BUG=webrtc:6592
Review-Url: https://codereview.webrtc.org/2445363003
Cr-Commit-Position: refs/heads/master@{#14854}
ba156cfe96