chromium/extensions/test/data/manifest_tests/file_handlers_valid.json

{
  "name": "test",
  "manifest_version": 2,
  "description": "App with file_handlers manifest.",
  "version": "1",
  "app": {
    "background": {
      "scripts": ["background.js"]
    }
  },
  "file_handlers": {
    "text": {
      "types": [
        "text/*"
      ]
    },
    "image": {
      "types": [
        "image/*"
      ],
      "extensions": [
        ".png",
        ".gif"
      ],
      "verb": "add_to"
    },
    "directories": {
      "extensions": ["*/*"],
      "include_directories": true
    }
  }
}