chromium/chrome/test/data/extensions/api_test/content_scripts/extension_process/manifest.json

{
  "name": "content_script_extension_process",
  "version": "1.0",
  "manifest_version": 2,
  "description": "Content scripts should get injected into web pages, even when the webpages are in an extension process.",
  "background": {
    "page": "background.html"
  },
  "content_scripts": [
    {
      "matches": ["http://*/*"],
      "js": ["injectionator.js"],
      "all_frames": true
    }
  ]
}