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docs: document inversion of control pattern

Bug: None
Change-Id: Ie895d32cd402b8596ca833d8bd43f172947052de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2463556
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817507}