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This CL is developed under a flag.
It displays the OpenIn.. toolbar to all files that support preview.

Bug: 1117398
Change-Id: I32ad05e7cf0de89f3407366fa6767a29af3b80f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2276269
Commit-Queue: Ewann Pellé <ewannpv@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800540}