Re: [w3c/ServiceWorker] Provide a way to attach data to clients (#1475)

Echoing a comment I made during the original discussion: a concern would be the size of the data if it's available synchronously from a snapshotted `Client` instance.  For example, right now Firefox arbitrarily limits each History API entry's state to 2,097,152 bytes.  This would be a lot of per-page memory for every clients.match() call to potentially entrain and/or have to ship around via IPC, especially for data that's intended for a page as its own consumer, not other pages.

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