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Also add a unit test to seed the base folder for testing.

Bug: 879035
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I031545c083f7dab84a1d0605cda16fc02f7367b6
Reviewed-on: https://chromium-review.googlesource.com/c/1306959
Commit-Queue: Trent Apted <tapted@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605224}