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Clicking the cancel button tells the scanner to cancel the currently
active scan job and immediately switches the UI back to ready state.

In a future update, a "Canceling Scan" UI will be shown when the cancel
button is clicked.

http://screen/73tpTmXpt8ALqR6

Bug: 1059779
Change-Id: I0aa8df9e85ad56e2b2c6e15318448e25ef95ee5b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533894
Commit-Queue: Gavin Williams <gavinwill@chromium.org>
Reviewed-by: Jesse Schettler <jschettler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827537}