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This parses the "ids" member according to the spec at
https://wicg.github.io/origin-policy/#parse-a-string-into-an-origin-policy,
and stores the result in the OriginPolicyContents structure.

The results are not yet used by any part of the system, and as such this
is not yet web exposed. That will be done in a follow-on patch, which
exposes them as self.originPolicyIds after plumbing them through Blink.

Bug: 1057123
Change-Id: I66637945486b5bd554605094a0e26b62c44558de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2087986Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Daniel Vogelheim <vogelheim@chromium.org>
Commit-Queue: Domenic Denicola <domenic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747594}