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This adds an optional message below the form in the show action form.
At the message's right there is a tappable icon that prompts a message.
In the prompt it's possible to add a button that opens an URL.


Bug: b/144083252
Change-Id: Iaa02a0660cc1f9cc7246e620f0579346a4d2d494
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1940174
Commit-Queue: Luca Hunkeler <hluca@google.com>
Reviewed-by: Clemens Arbesser <arbesser@google.com>
Cr-Commit-Position: refs/heads/master@{#721682}