chromium/chrome/test/data/extensions/api_test/messaging/connect_nobackground/manifest.json

{
  "name": "connect_nobackground",
  "version": "1.0",
  "manifest_version": 2,
  "description": "Tests that a content script can notify an extension in a tab.",
  "content_scripts": [{
    "matches": ["*://*/*?will_test_connect_and_sendMessage"],
    "js": ["contentscript.js"]
  }]
}