Wallpaper rotator for ChromeOS

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Wallpaper rotator for ChromeOS",
  "short_name": "Wallpaper",
  "description": "Sets the wallpaper with images from a folder.",
  "version": "0.1.3",
  "minimum_chrome_version": "40",
  "icons": {
    "16": "assets/icon_16.png",
    "48": "assets/icon_48.png",
    "128": "assets/icon_128.png"
  },
  "app": {
    "background": {
      "scripts": [
        "background.js"
      ],
      "persistent": false
    }
  },
  "permissions": [
    {
      "fileSystem": [
        "directory",
        "retainEntries"
      ]
    },
    "storage",
    "wallpaper",
    "background",
    "alarms",
    "notifications"
  ],
  "commands": {
    "next-wallpaper": {
      "suggested_key": {
        "chromeos": "Search+N"
      },
      "description": "Next Wallpaper",
      "global": true
    }
  }
}