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Shelf items used to be aligned directly after the launcher button,
so it made sense to include everything within bounds where tooltips
should not hide to avoid hiccups.

However, now that we show centered shelf items, this means that a
tooltip can be shown all over a possibly quite large amount of white
space between the launcher button and the first shelf item.

1) It is very strange to show a tooltip over such a potentially large
piece of shelf. 2) On the other hand, when it does happen that the
first shelf item is close to the launcher button, not showing a
tooltip in the space between them does mean a slight stutter when
hovering from one to the next.

The drawbacks of 1) clearly outweigh the ones of 2), so this change
hides tooltips between the launcher button and the first shelf item.

Bug: 896524
Change-Id: I06e666ba0296881f87c2cf3ce5972b38d638c3f7
Reviewed-on: https://chromium-review.googlesource.com/c/1393889
Commit-Queue: Manu Cornet <manucornet@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619727}