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Adds a link button after a successfully scan that calls the
ScanningBrowserProxy to open the Files app. The last page of the scanned
in the scan job will be highlighted.

A follow up CL will use the return value from the call to
showFileInLocation() to show an error-state when Files app fails to
open.

http://screen/BANhubFawHU6oLM

Bug: 1059779
Change-Id: I0368c91393382f5f46ea21dd530801e12a4035cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2546102
Commit-Queue: Gavin Williams <gavinwill@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831155}