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This CLs plumbs the viewport intersection to the FrameNode, which
will allow the tracking of the visibility of each frame.

Bug: 1077217
Change-Id: Id2811b1c52e4fa3f3c449d1b32a1cb7084f82116
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2399621Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Commit-Queue: Patrick Monette <pmonette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816728}