[scheduler] Blink-style enum names in scheduler

R=haraken@chromium.org

Change-Id: Ia88e4aefd42f295a0768dd9ae68e6b2f822d84ed
Reviewed-on: https://chromium-review.googlesource.com/766794
Commit-Queue: Alexander Timin <altimin@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#516302}
48 files changed