This is a reland of d045f666

Original change's description:
> [tools] Push files using high-level device.PushChangedFiles method
>
> R=machenbach@chromium.org
>
> No-Try: true
> Bug: chromium:893593
> Change-Id: I11cce7694eb7755ccee42c9a342fc1aa22663d85
> Reviewed-on: https://chromium-review.googlesource.com/c/1382468
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Commit-Queue: Sergiy Belozorov <sergiyb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#58407}

Bug: chromium:893593
Change-Id: I88a7143b3f31d87d266b89221f81efe831ea3823
Reviewed-on: https://chromium-review.googlesource.com/c/1443055
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59221}