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IsValidIndex() captures the very same preconditions but calling out the
validity of the parent in dedicated DCHECKs helps readability and allows
understanding user reports better.

Bug: 1051614
Change-Id: If10e53fc52b3f6003dba9f9b2bf386ccf75de3e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2054165
Auto-Submit: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741114}