✨ Google Ad Manager Publisher first-party IDs #40249
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Addresses #40248.
Implements both cookie writing and reading components described in the linked I2I. In particular, we will set the specified cookies on the ad response HTTP header, and add those cookies to ad requests when available. We also add here some ads utility functions for verifying user consent for cookies, and some global cookie utility functions for checking whether setting cookies is allowed.
This change on its own is mostly a no-op, as serving is not yet setup to send to the new HTTP cookie header.