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To safely change Button class' default focus behavior, we need to
explicitly set all subclasses' focus behavior. To show these changes are
preserving the existing behavior, this CL adds DCHECKs to show the
current behavior. We will delete all the DCHECKs once Button's default
behavior is being flipped.

Bug: 1001103
Change-Id: Ic76bc2ffaa3dfb90b7cd93b59c0a6051e9f5d9d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2473562Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Wei Li <weili@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817723}