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This CL pulls out the tasks from the chromeos folder and moves it to the
webshare root folder so the macOS implementation can use it.

Bug: 1144920
Change-Id: I942399d1da8759bcbd77e46a3fde0b400e96789c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2615664
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841319}