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Views now rely on layout manager for both preferred and minimum size,
and layout managers can be notified when a view's layout is invalidated.

Change-Id: I189eab4bf1ab4369db0d7ca5391b432ac3424fcc
Reviewed-on: https://chromium-review.googlesource.com/c/1351967
Commit-Queue: Dana Fried <dfried@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611507}