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Setup a new builder for executing the Files app
browser_tests to start collecting code coverage
for their execution.

This builder is based on the linux-chromeos-code-coverage
CI builder.

Accompanying internal CL is chrome-internal:3318844.

Bug: 1113941
Cq-Depend: chromium:2345831
Change-Id: I39529060e6688d58baf04ff3644f227710f9df74
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2453336Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Ben Reich <benreich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816023}