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Add focus traversal to ScrollableShelfView

Bug: 973481
Change-Id: I3beeea53aff1ed32ccb588f2033ab67851590574
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1767484
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691759}