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This CL fixes tooltips for:

- Holding space tray
- Holding space chips
- Holding space screen captures

Previously tooltips did not work because descendant views were
obstructing the views that implemented the tool tipbehavior or, in
the case of screen capture views, because tooltips had not previously
been implemented.

Bug: 1162050, 1164333
Change-Id: If924ff9e6e6edaa9b2d889c4b46c1180a5844f20
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2618476Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#841745}