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Take color-scheme meta tags into account and set the content background
color for the page to the dark background before we start committing
frames for the document. This way we can avoid white flashes navigating
between dark schemed pages if there are e.g. slow render blocking
stylesheets blocking rendering.

Bug: 1103667
Change-Id: I1ed110bf652dd4936bf6669e6b9cd634c0f73b0a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438532Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814347}