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The Beta experiment shows that using USER_BLOCKING priority does not
negatively affect performance. In Slow Reports traces, we observed
that using BEST_EFFORT priority caused jank. Also, BEST_EFFORT is
not an appropriate priority to perform work that is visible to
the user. Therefore, this CL permanently changes the priority of
the video capture service to USER_BLOCKING. See
go/videocaptureservice-finch-june2020

Bug: 1066137
Change-Id: Iff96490fb90278159a7086fea7ec1523a9f78848
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2276237
Auto-Submit: François Doray <fdoray@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Robert Kaplow <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#785371}