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So that it will report error at compile time when we forget to request
the lock before accessing the variables.

Bug: b/176461326
Test: Build successfully
Change-Id: Iac8404fc609ec7a6b2e86bbbdb3e71662e71aa69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2602966
Commit-Queue: Wei Lee <wtlee@chromium.org>
Reviewed-by: Shik Chen <shik@chromium.org>
Auto-Submit: Wei Lee <wtlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841932}