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This change adds wake lock service to acquire and release cpu wake
locks.

BUG=68944053
TEST=Verified cpu wake lock acquisition and release.

Change-Id: I7353ee394e9a400b4a32d182e551700162ce15a5
Reviewed-on: https://chromium-review.googlesource.com/936051Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Luis Hector Chavez <lhchavez@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Commit-Queue: Abhishek Bhardwaj <abhishekbh@google.com>
Cr-Commit-Position: refs/heads/master@{#542683}