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This CL introduces a new SEND_FEEDBACK chip type that shows the feedback
form when it is selected.

This new chip type can only be used inside a Prompt atm, but follow-up
CLs will expose the feedback chip for more use cases (e.g. client
errors).

Bug: b/173401004
Change-Id: Idea938ed9f3706ab88be7da2bcf1c34be5a3eb5b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2617923Reviewed-by: Clemens Arbesser <arbesser@google.com>
Commit-Queue: Jordan Demeulenaere <jdemeulenaere@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841488}