Re: [w3c/manifest] Document the unique identifier or tuple of identifiers for a PWA (#586)

https://pwa-directory.appspot.com/ has a collection of 1366 manifests; of these around 71 (5%) look "versioned":

```
$ curl -sSL 'https://pwa-directory.appspot.com/api/pwa/?limit=4000' | jq -r '.[] | .manifestUrl' | sort | perl -ne 'print if /[0-9a-fA-F]{7}/ || /v[0-9]+/ || /v=/'
https://ademola.adegbuyi.me/_nuxt/manifest.1c4bdc21.json
https://app.mangahigh.com/fea_201803191329/misc/mobile-manifest.json
https://assets.production.spokeo.com/assets/v9/manifest-25a702bcac88b536992cff4cc78d9e75d7d40dc36f746ed69604a2c40d0aba5d.json
https://beta.mic.com/manifest.json?b=1478894131181397
...
```
<details>
<pre>
https://ademola.adegbuyi.me/_nuxt/manifest.1c4bdc21.json
https://app.mangahigh.com/fea_201803191329/misc/mobile-manifest.json
https://assets.production.spokeo.com/assets/v9/manifest-25a702bcac88b536992cff4cc78d9e75d7d40dc36f746ed69604a2c40d0aba5d.json
https://beta.mic.com/manifest.json?b=1478894131181397
https://betcruncher.com/manifest.3183cc2d8ff6fa85748fc8c6a4f796cd2a95d2e9.json
https://big-andy.co.uk/content/themes/v5/manifest.json
https://blackjack.io/manifest.9f463e8a23e16b31f7219dce967e1df6.json
https://blendle.com/manifest-5a96b3b4ec.json
https://boardom.io/manifest.json?v=3
https://bookourplane.com/manifest.json?v=LbbRAnjJQL
https://browsersync.io/manifest.json?v=qAqkxQaJm0
https://cdn.bloodhorse.com/current/favicons/manifest.json?v=KmbG9gpjz7
https://cdn.getyourguide.com/static/c6754d394589/customer/desktop/static/manifest.json
https://cdn.lyft.com/webclient/icons-463e5ce/manifest.json
https://cdn.shopify.com/s/files/1/0014/1962/t/21/assets/manifest.json?17982843544509738478
https://choualbox.com/manifest.json?v=1282
https://clay.io/manifest.json?data=eyJpY29ucyI6W3sic3JjIjoiaHR0cHM6Ly9jZG4ud3RmL2QvaW1hZ2VzL3N1cGVybm92YS9pY29uLnBuZyIsInNpemVzIjoiMjU2eDI1NiIsInR5cGUiOiJpbWFnZS9wbmcifV0sInNob3J0X25hbWUiOiJDbGF5IEdhbWVzIiwibmFtZSI6IkNsYXkgR2FtZXMiLCJzdGFydF91cmwiOiIuLz91dG1fc291cmNlPXdlYl9hcHBfbWFuaWZlc3QiLCJiYWNrZ3JvdW5kX2NvbG9yIjoiI2ZhZmFmYSIsInRoZW1lX2NvbG9yIjoiI2ZmOGEwMCIsImRpc3BsYXkiOiJzdGFuZGFsb25lIn0=
https://cs1.wettercomassets.com/wcomv5/images/icons/favicon/manifest.json?201708031719
https://d1c42d2bmccy49.cloudfront.net/manifest.json
https://dev-quests.appspot.com/static/manifest.b9d743cdb670650edbb180662a9443e56add2d7fcbc9e7c5d7f73c7bfd20ded5.json
https://developer.chrome.com/devsummit/static/manifest.32a1e88bd98d232c73fbf2f2c5ff552b4c9782f991d6114a3ffa17c5f9390528.json
https://devpractic.es/notifmanifest.php?v=635
https://direct.asda.com/on/demandware.static/-/Sites-ASDA-Library/default/dwb2a11ac9/Manifest/manifest.json
https://ephemeral.now.sh/manifest.91ccc2dacd83c8815c8286043c23a9ae.json
https://erwinandres.github.io/tudu/manifest.json?v=2
https://facerepo.com/app/images/favicons/manifest.json?v=a701bd98
https://feeddeck.glitch.me/manifest.json
https://flat.io/manifest.json?v1
https://grocery.walmart.com/js/icons-4b00caed44fcb95f57dd4efc82d1a2c2/manifest.json
https://hn.nuxtjs.org/_nuxt/manifest.d7491a08.json
https://hpbn.co/7a58c37113db4464699ec4f4646b5566.json
https://jimdo-dolphin-static-assets-prod.freetls.fastly.net/cms/static/manifest.c4bb9662.json
https://kuranz.com/manifest.0252de652255e03775ee2f57d96ec003.json
https://m-travel.jumia.com/manifest.9cd19691.json
https://m.apkpure.com/manifest_v10.json
https://m.avito.ru/s/mobile/web-app-manifest.json?5e1ff91
https://m.badoo.com/badoo/manifest-en.json?v101
https://m.gala.de/r1519124462501/manifest.json
https://magento-imagine-2018.firebaseapp.com/_nuxt/manifest.555d3617.json
https://magnetis.com.br/assets/magnetis_app/manifest-638829635f8669ddb668e944e37aee4241964bd32d7f2dd857d1d7c8e16e8bfd.json
https://memoui.com/static/20180412001537/manifest.json
https://motog3.com/wp-content/plugins/onesignal-free-web-push-notifications/sdk_files/manifest.json.php?gcm_sender_id=995691934152
https://preact-pwa-yfxiijbzit.now.sh/manifest-a57e627c89.json
https://prpl-dot-captain-codeman.appspot.com/20170806/es6-unbundled/manifest.json
https://quillie.net/manifest.38100eca.webmanifest
https://reittiopas.foli.fi/icons-turku-6aa88e8a010a06d1d30d24205371f8d3//manifest.json
https://rofr.in/manifest.json?v6=bOO8oaa856
https://schsrch.xyz/resources/0350094f9232803bcc0fd86c3cbd31f1.json
https://sp-web.search.auone.jp/manifest_v2.json
https://ssl.tzoo-img.com/res/favicon/manifest.json?v=2kq2msw2
https://static1-ssl.dmcdn.net/images/neon/favicons/manifest.json.vb58fcfa7628c92052
https://static3.1tv.ru/assets/web/favicon/manifest-1d3e08042839f3a7499da28ea190f0d5.json
https://theomg.github.io/Lifelike/manifest.ee9a11377982a365a8aeae5b9095fe11.json
https://townwork.net/js/manifest?v=20160302001
https://travel.jumia.com/manifest.9fa818c2.json
https://unacademy.com/dist/manifest.json?1487235791853
https://unacademy.com/dist/manifest.json?1505821603929
https://weather.com/weather/assets/manifest.507fcb498f4e29acfeed7596fe002857.json
https://webamp.org/manifest.60fc98cc18ea0b3ab073cda74610efa1.json
https://www.amarujala.com/manifest.json?v=85b484467f
https://www.boldsky.com/browser.json?v=1.0.1
https://www.buzzfeed.com/static-assets/data/manifest.0edfa72a42a9e70e5bf211f64eae9384.json
https://www.colorblindsim.com/manifest.8b7a3d31.webmanifest
https://www.cookscountry.com/_search_assets/cco-manifest-707681872ff6b432492f3fe509aaae89.json
https://www.elo7.com.br/v3/manifest/webapp.json
https://www.freecharge.in/mobile/manifest.json?v=1
https://www.ft.com/assets/manifest/manifest-v6.json
https://www.gp.se/polopoly_fs/3.200.1523348202!/sites/se.gp/images/manifest.json
https://www.iheart.com/manifest.6a2f10c7f194b2a76747f18937e42951.json?rev=7.44.0
https://www.imperialcarsupermarkets.co.uk/manifest.json?v=gAEgYPxJpw
https://www.istitlaa.me/_nuxt/manifest.57352a3d.json
https://www.johnlewis.com/assets/fc539d9/favicons/manifest.json
https://www.koolsol.com/manifest-20170311-01.json
https://www.koolsol.com/manifest-20170526-01.json.php
https://www.liverpoolecho.co.uk/manifest.json?v=548e74556b39b6b25a2b7a4828f7783e
https://www.nouvelobs.com/manifest.json?1510150956
https://www.onthemarket.com/assets/52bbb4af/gzip/js/manifest.json
https://www.onthemarket.com/assets/80f6edfa/gzip/js/manifest.json
https://www.openrent.co.uk/manifest.json?v=9BaGKJ78xe
https://www.otto.de/static/all/img/global-resources/fc44d9d421d3577b/favicons/manifest.json
https://www.otto.nl/3ce8d08884c912ec9b98774bab49a8eff3604010/assets/ottonl/resources/manifest.json
https://www.padpiper.com/manifest.ab5a95547c7ae8833813533907eb0631.json
https://www.pigiame.co.ke/assets/pi-site/favicon/site-ad611bc177.webmanifest
https://www.pitchup.com/manifest.json?v=4
https://www.pricehipster.com/manifest.json?v=1
https://www.reittiopas.fi/icons-hsl-18da13427c6e362f148f4a5b783ee98c//manifest.json
https://www.selcobw.com/skin/frontend/selco/default/assets/manifest.json?6335544
https://www.sho-yamane.me/_nuxt/manifest.7e00d6b4.json
https://www.stylewe.com/manifest.json?v=9255619
https://www.thekitchn.com/assets/tk/favicons/manifest-8afd9804080ba4ee9351cb5adc20383f47f40fe276d62bd25467bdadf5d5c0d6.json
https://www.viz.com/favicon/manifest.json?v=oLLRlE8ljO
https://www.walmart.ca/assets/9d1a7c78e21cc1c3c71ae9f8a8918b0d-home-screen-manifest-en.json
https://www.yiv.com/manifest.json?2017022101
</pre>
</details>

<br/>

So if Chrome and others switch to using manifest URL to uniquely identify PWAs (and this data is representative of PWAs in general), then around 5% of sites will generate a new A2HS prompt when the manifest URL changes (perhaps only when the content of the manifest changes, but potentially on every deployment).

(Is Chrome using manifest URL right now? I tried changing the manifest URL on a test site and didn't get the A2HS prompt. So I suspect Chrome is currently applying a different heuristic to identify new/updated PWAs.)

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