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If enable-threaded-compositing is specified (via a threaded virtual test,
or on the command line), along with the display compositor dumps, then
we don't need to synchronously composite frames. Instead we should rely
on surface synchronization to wait for frames to be submitted via
a scheduler.

R=piman@chromium.org, fsamuel@chromium.org

Bug: 667551
Change-Id: I05859b1ebe18cc59379514d604268940714250b0
Reviewed-on: https://chromium-review.googlesource.com/1026563Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: vmpstr <vmpstr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553885}