This fixes an issue where the media budget in the pacer was allowed to
increase more than the process interval when congested.
Bug: webrtc:8415
Change-Id: I79bf965b6a72ed88313074cdae4746fcaff63340
Reviewed-on: https://webrtc-review.googlesource.com/80121
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23531}