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This CL adds a single file title preview for share sheet feature on Chrome OS devices.

Note: This feature is not in its final form and is still open to extension

Bug: 1157628

Change-Id: I44acc5a0c3fc231e66f1a77b77542d39931bb772
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2584632
Commit-Queue: Angela Gyi <angelagyi@google.com>
Reviewed-by: Maggie Cai <mxcai@chromium.org>
Reviewed-by: Melissa Zhang <melzhang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841382}