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DevTools was using CompositorFrameMetadata for screen capture.
This change refactors things so that:
- Metadata update and actual capture are split into two steps.
- When SurfaceSync is on we use RenderFrameMetadata for update.

Bug: 955042
Change-Id: I7479305c1bcbcecf94587cb69960da7bb6ff01a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1584923
Commit-Queue: Eric Karl <ericrk@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654651}