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Build on existing naive PosInSet and SetSize implementation to handle
cases such as inconsistent or invalid assignments of kPosInSet and
kSetSize attributes

Change-Id: I966f3ad00e778e0d68bcb48d160f1be5818b587b
Reviewed-on: https://chromium-review.googlesource.com/c/1340523
Commit-Queue: Akihiro Ota <akihiroota@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609017}