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Hiding browser controls can make the layout viewport larger than the
document's layout overflow.  Bottom-anchored fixed-position elements
were incorrectly clipped with RLS, because the scrolling contents layer
was sized to match the overflow rect.

Bug: 817714
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I89c3488370e1bce02a7ed523e930ab9d634f60ac
Reviewed-on: https://chromium-review.googlesource.com/954016Reviewed-by: David Bokan <bokan@chromium.org>
Commit-Queue: Steve Kobes <skobes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542087}