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This is a reland of 635cbc1a

Change: Added missing variable initialization.

Original change's description:
> Views: Add BoxLayoutView
>
> This CL adds class member getters and setters to the BoxLayout class
> where needed for the BoxLayoutView properties. Adds a TODO to ensure
> layout is invalidated when these members are set.
>
> Bug: None
> Change-Id: I13d73c75ca93f9de391b46c7241682ee7ced9a89
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434561
> Reviewed-by: Wei Li <weili@chromium.org>
> Commit-Queue: Thomas Lukaszewicz <tluk@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#813351}

Bug: None
Change-Id: I850dfcc06c75bd49073e6aa0d0cc51471d5ebbb0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2451554Reviewed-by: Wei Li <weili@chromium.org>
Commit-Queue: Thomas Lukaszewicz <tluk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814309}