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NG did not traverse children, which are needed for Focus rings.

Bug: 835484
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: I33a326b18da85b65f76b5035634d9b8151431313
Reviewed-on: https://chromium-review.googlesource.com/1022979
Commit-Queue: Aleks Totic <atotic@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552904}