chromium/chrome/test/data/extensions/api_test/service_worker/webrequest/manifest.json

{
    "manifest_version": 2,

    "name": "Extension service worker - webrequest test",
    "description": "Extension service worker - ensure onBeforeRequest is triggered",
    "version": "1.0",

    "background": {
        "scripts":["background.js"],
        "persistent": true
    },
    "permissions": [
        "webRequest",
        "*://*/*"
    ]
}