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This CL adds integration tests for sharesheet button in the files app.

BUG=1097623

Change-Id: If6ca472a1d9cc4b83b4ed547f717f0770c574f91
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2351262
Commit-Queue: Maggie Cai <mxcai@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798005}