Adds a pending frame to VideoStreamEncoder that is used to store frames
that are not sent because the encoder is paused. If the encoder is
resumed within 200 ms, the pending frame will be encoded and sent. This
ensures that resuming a stream instantly starts sending frames if it is
possible.
This also protects against a race between submitting the first frame
and enabling the encoder that caused flakiness in end to end tests
when using the task queue based congestion controller.
Bug: webrtc:8415
Change-Id: If4bd897187fbfdc4926855f39503230bdad4a93a
Reviewed-on: https://webrtc-review.googlesource.com/67141
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22781}
dcc7e88cc7