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The cc/scheduler/scheduler_state_machine uses a lot of enums.
enums are not real types and hence have subtle problems.
C++ introduced the concept of "enum class" types which would
be better replacements.

BUG=440759

Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I12ce9ee05b668bee5c2f84bbe522edd741d2bd56
Reviewed-on: https://chromium-review.googlesource.com/709094
Commit-Queue: Alexander Timin <altimin@chromium.org>
Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520959}