[LayoutNG] HandleInflow() return a bool rather than WTF::Optional<>.
This way we won't need previous_inflow_position in Layout() to be optional, and
it makes the code more readable, and possibly more efficient too.
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: Id42f5b950cf2edec646d5bf8b594b8d4b9948449
Reviewed-on: https://chromium-review.googlesource.com/590427
Commit-Queue: Morten Stenshorne <mstensho@opera.com>
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#490364}2 files changed
