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Ablation study to evaluate impact of Jobs API.
This CL splits job specific behavior in several features:
- worker wake up strategy (with additional serial strategy)
- yield
- fair scheduling
- priority update

Additional study specific to Jobs:
wakeup after getwork: This has the potential benefit of reducing lock
contention when workers wakeup.

Bug: 1139440
Change-Id: I5397977352650ee30557dc8972f32df34798b398
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2481522
Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820953}