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This is the implementation of the out-and-back routing DOM focus
design for OS Settings [1]. Compare the tip of tree [2] behavior with
the post-fix [3] behavior.

[1] https://docs.google.com/document/d/1iNewLPex50WuF2ByJa3w250q_WdBbwCfVIo8C5RM6-w/edit?usp=sharing
[2] https://drive.google.com/open?id=1aVRaRrwsMGxYiQ3_FXWSyekeMWOVkCo8
[3] https://drive.google.com/open?id=1A5iVSDgTa7ciqy2rK52B0qqEulw-mR18


Bug: 1003992
Change-Id: I1510a6c231270b3509ebd0c45750979781ee4a0b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900152Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Jordy Greenblatt <jordynass@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715012}