Specifically, this change replaces peak_period_counter_ms_ with peak_period_stopwatch_ which obtains a Stopwatch object from TickTimer. Necessary plumbing to get the TickTimer through to the DelayPeakDetector is also included. BUG=webrtc:5608 NOTRY=True Review-Url: https://codereview.webrtc.org/1921163003 Cr-Commit-Position: refs/heads/master@{#12542}