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When content is shared in the Sharing Hub v1 include a preview
showing the page favicon, title, and url.

http://screen/704072c1-8ebf-4764-8660-0aa67c95dfa4.png

Bug: 1120093

Change-Id: Iea5b67f063fcf663917badd84bdeacb5942959dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2367442
Commit-Queue: Kyle Milka <kmilka@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Reviewed-by: Tanya Gupta <tgupta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805474}