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No functionality changes here, but just moving the code and implementing
missing interfaces in PlatformWindow.

Bug: 990756
Change-Id: Ia39b15c580ea831a5e31bb6d76a807b3321c4f4f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1844820
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704605}