On reaching the end of the content we would notify content complete
and skip unplayed ads, causing a timeline change. That timeline change
was handled in a way that caused a further timeline change in the
2.11.6 release, where we don't yet deduplicate no-op Timeline changes,
causing repeated timeline changes indefinitely.
At tip-of-tree, the timeline wouldn't refresh repeatedly. However the
code for sending content complete at the point of transitioning to
play a preloaded postroll ad was not correct in that it didn't mark
previous ads as skipped. Instead they happened to be marked as
skipped later on due to the timeline change handling content
completion code triggering again.
Fix this by only marking ads as skipped when content completes once,
to avoid the duplicate timeline change, and moving the skipped ad
marking so it happens in the same place as notifying content complete.
PiperOrigin-RevId: 318454908
eb9de7a120