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We're noticing that running the video.rAF as part of the rendering steps
isn't always performant since the BeginFrame powering window.rAF is run
much later than the one powering video rendering - resulting in frequent
misses.

While trying to diagnose this issue and whether we should switch to
using a microtask we're running into issues where dev builds are not as
performant as official builds, so to ease testing and analysis land a
temporary microtask version of video.rAF behind a flag so we can compare
using Mac/Win canary builds more effectively.

Bug: 1012063
Change-Id: Ie0609717d1863800550e858efbe144c8c0dde624
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2076180
Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745602}