chromium/chrome/test/data/extensions/js_injection_background/manifest.json

{
  "name": "js_injection_background",
  "description": "Tests JS injection into an extension's background page.
    The name of a DOM node in the background page is returned and verified.",
  "version": "0.1",
  "manifest_version": 2,
  "background": {
    "page": "bg.html"
  },
  "browser_action": {
    "default_title": "Browser Action"
  }
}