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This patch introduces a new action to display message popups (bubbles)
in the bottom sheet anchored at the icon.

R=arbesser@google.com

Bug: b/132863319
Change-Id: I51d2d885937e6e50e8273217c481b606be7a91d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1681771
Commit-Queue: Mathias Carlen <mcarlen@chromium.org>
Reviewed-by: Clemens Arbesser <arbesser@google.com>
Cr-Commit-Position: refs/heads/master@{#673345}