kiosk: Add kiosk.required_platform_version manifest key

extensions/common/api/_manifest_features.json

Index: extensions/common/api/_manifest_features.json
diff --git a/extensions/common/api/_manifest_features.json b/extensions/common/api/_manifest_features.json
index 5be1265d99fe3a30519b7a5326ac53f82ff1669d..3ff79a2edd7cc57261e5f0961c28d6d0c1e822bb 100644
--- a/extensions/common/api/_manifest_features.json
+++ b/extensions/common/api/_manifest_features.json
@@ -288,6 +288,10 @@
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app"]
   },
+  "required_platform_version": {

[asargent_no_longer_on_chrome, 2016/01/19 22:11:00]

I don't think this is a feature we'd ever consider launching for non-kiosk mode,
so I think it would make sense to somehow indicate in the name of this manifest
property that this is kiosk-specific. Ideally that might look something like the
following in a manifest.json file:

{
  "name": "My Kiosk App",
  "version": "2",
  "manifest_version": 2,
  "kiosk_enabled": true,
  "kiosk_only": true,
  "kiosk": {
    "required_platform_version": "1.2.3.4"
  }
}


You can declare that in this file by doing:

"kiosk.required_platform_version" : {
  ...
}



(See app.background, background.persistent, etc. for examples)

[xiyuan, 2016/01/19 23:40:52]

Done.

+    "channel": "stable",

[asargent_no_longer_on_chrome, 2016/01/19 22:11:00]

Please set channel to canary or dev until you have launch approval

[xiyuan, 2016/01/19 23:40:52]

Done.

+    "extension_types": ["platform_app"]
+  },
   "sandbox": {
     "channel": "stable",
     "extension_types": [