This adds a new command abstraction for running commands on Android
using dockered devices on swarming.

The new abstraction handles pushing all required files to the device.
The logic used for pushing and running is reused from the perf runner.

This adds only the mjsunit test suite. Others will be handled in
follow up CLs. The suite logic is enhanced with auto-detection of files
to be pushed to devices, for e.g. load or import statements.

Some test cases need an extra resource section for specifying required
files.

Remaining failing tests are marked in the status files for later
triage.

Bug: chromium:866862
Change-Id: I2b957559f07fdcd8c1bd2f7034f5ba7754a31fb7
Reviewed-on: https://chromium-review.googlesource.com/1150153Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55041}