This is a reland of 72e6cb0b3f548900fd3b548b4b6966e3f5ee854f
Was not the cause of perf alert, relanding.
TBR=ilnik@webrtc.org
Original change's description:
> Fixes dynamic mode pacing issues.
>
> This CL fixes a few issues in the (default-disabled) dynamic pacing
> mode:
> * Slight update to sleep timing to avoid short spin loops
> * Removed support for early execution as that lead to time-travel
> contradictions that were difficult to solve.
> * Makes sure we schedule a process call when a packet is due to be
> drained even if the queue is empty, so that padding will start at
> the correct time.
> * While paused or empty, sleep relative last send time if we send
> padding while silent - otherwise just relative to last process
> time.
> * If target send time shifts so far back that packet should have
> been sent prior to the last process, make sure we don't let the
> buffer level remain.
> * Update the PacedSender test to _actually_ use dynamic processing
> when the param says so.
>
> Bug: webrtc:10809
> Change-Id: Iebfde9769647d2390fd192a40bbe2d5bf1f6cc62
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/160407
> Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
> Commit-Queue: Erik Språng <sprang@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#29911}
Bug: webrtc:10809
Change-Id: Ie7b307e574c2057bb05af87b6718a132d639a416
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/160786
Reviewed-by: Erik Språng <sprang@webrtc.org>
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Commit-Queue: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29928}
b1ccae253e