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Exposes a setting and an interface for enabling externally-controlled
BeginFrames in ui::Compositor and adds a command line flag for the
full-pipeline scheduling mode.

Bug: 646774
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_site_isolation
Change-Id: I923b5ab66652c65c1384b9fe5075c0a427559fc6
Reviewed-on: https://chromium-review.googlesource.com/558252
Commit-Queue: Eric Seckler <eseckler@chromium.org>
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#490719}