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Also, add some comments...

Bug: 1145787
Change-Id: I64fc705e671f5534d523d2b9c1ec1d7f01b64c1b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2522575
Commit-Queue: Darwin Huang <huangdarwin@chromium.org>
Reviewed-by: Jarryd Goodman <jarrydg@chromium.org>
Auto-Submit: Darwin Huang <huangdarwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825097}