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This CL adds a single example of a ShareAction for
testing the content previews feature on Chrome
OS devices.

Bug: 1159279
Change-Id: Ia8e0e5dfbc00ab664468667363ece01f4b71ad1d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2592276Reviewed-by: Melissa Zhang <melzhang@chromium.org>
Commit-Queue: Angela Gyi <angelagyi@google.com>
Cr-Commit-Position: refs/heads/master@{#840058}