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Test launcher relies on the fact that TaskScheduler won't have more
concurrency than max_tasks to control |num_parallel_jobs|. The
TaskScheduler is allowed to run more tasks concurrently than
|max_tasks| when some of these tasks are blocked.
This CL converts Test launcher to using Jobs and ensures that
|runner_count_| concurrency is respected.

Bug: 905788
Change-Id: Ia090271e11b322140da1bf7e1526f4ba16bfb524
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414556
Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812145}