Re: [w3c/IndexedDB] Encrypted storage (#191)

This topic came up internally as well. Lots of enterprises want on-device storage encryption (e.g. see [SQLCipher](https://www.zetetic.net/sqlcipher/) which is popular for SQLite in native apps). One suggestion was to extend the manifest with something like:

```json
{
  "encrypted": true
}
```

Ideally though this would encrypt all forms of origin storage - LocalStorage, cookies, IDB, caches, etc. There'd also need to be an API surface so that developers can feature-detect and fall back to the WebCrypto API in cases where the built-in encryption is unsupported.

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