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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/+/2434561Reviewed-by: Wei Li <weili@chromium.org>
Commit-Queue: Thomas Lukaszewicz <tluk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813351}