GitLab

This particular change should not cause any behaviour change.

This new distinction will be used for at least two purposes in the
near future:

1) provide accessibility feedback (alert) when an item has been
   pinned to, or unpinned from, the shelf

2) provide visual feedback when an item has been pinned to the
   "scrollable" shelf (for instance scroll the scroll view to have
   the new item within the viewport).

Neither of these interactions should happen when the pinning/unpinning
is not a result of a user-initiated action, such as in callbacks to
sync events.

Bug: 1012772, 1010697
Change-Id: Ib581aa05841826b78a7ba8cfe5d2b0a52f367810
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1925439
Commit-Queue: Manu Cornet <manucornet@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#717748}