参考
https://support.google.com/chrome/a/answer/2714278?hl=ja
manifest.jsonを作る
{ "manifest_version": 2, "name": "test app", "description": "テスト用のアプリケーションです。", "version": "1.1", "icons": { "128": "128.png" }, "app": { "urls": [ "http://certification.googleapps.com/app-info/" ], "launch": { "web_url": "http://certification.googleapps.com/" } }, "permissions": [ "unlimitedStorage", "notifications" ] }