chromium/chrome/test/data/extensions/api_test/tts_engine/network_speech_engine/manifest.json

{
  "name": "chrome.tts",
  "version": "0.1",
  "manifest_version": 2,
  "description": "browser test for chrome.tts API",
  "background": {
    "scripts": ["test.js"],
    "persistent": true
  },
  "permissions": ["tts"]
}