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Figured this would be a useful API extension while refactoring.

Bug: b/175360169
Change-Id: If6490aefacdb5110d3fe5dc423d311e6f7618c12
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2584434
Commit-Queue: Nic Hollingum <hollingum@google.com>
Reviewed-by: Daniel Ng <danielng@google.com>
Cr-Commit-Position: refs/heads/master@{#837750}