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This introduces a few basic checks, but does not robustly handle all
corner cases. This also does not handle serving the response, but rather
just storing it.

Bug: 1138639, 1138640
Change-Id: I9e1698156e717754541a9e18f1316c42326b9949
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2486454
Commit-Queue: Ryan Sturm <ryansturm@chromium.org>
Reviewed-by: Nicolas Ouellet-Payeur <nicolaso@chromium.org>
Reviewed-by: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819453}