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This will contain functionality that is shared between desktop and
android wptrunner. For now it's just copying the output to
full_results.json but the plan is to start adding support for more files
that are needed by the results viewer.

Change-Id: Iedd7e9a624274d90dd79f91c60ae3452d483a1f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2218528Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Reviewed-by: Rakib Hasan <rmhasan@google.com>
Reviewed-by: Robert Ma <robertma@chromium.org>
Commit-Queue: Luke Z <lpz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774624}