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Currently, we jump to the compositor thread in order to set the
new frame presented callback on the VideoFrameCompositor.

This CL is a small change that allows us to set that callback from the
main thread. This should help minimize the amount of frames we miss in
video.rAF calls.

Bug: 1012063
Change-Id: I521eb0bf0a6e71f59552c60276006e1884c1f989
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040436
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Auto-Submit: Thomas Guilbert <tguilbert@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738770}