GitLab

Long delay canceled tasks can really pile up if we don't activly remove
them. We already do that in the renderer but we need to bring this
technology to other SequenceMangers.

Bug: 863341
Change-Id: Ie16674043028090f94c184c02acbef6efcf3471b
Reviewed-on: https://chromium-review.googlesource.com/c/1483076
Commit-Queue: Alex Clarke <alexclarke@chromium.org>
Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Alex Clarke <alexclarke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635497}