chrome/test/data/extensions/platform_apps/speech/background_page/manifest.json

{
  "name": "Platform App Test: Speech recognition",
  "manifest_version": 2,
  "description": "webkitSpeechRecognition test from background page of an app.",
  "version": "1",
  "permissions": [
    "audioCapture"
  ],
  "app": {
    "background": {
      "scripts": ["test.js"]
    }
  }
}