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Add toplevelwarning about old Chrome

See original GitHub issue

Provide the steps to reproduce

Run LH on https://d13z.dev using lighthouse@next npm package
Performance score in result is null

What is the current behavior?

After running lighthouse from a nodejs script, the performance score result is null. Other categories have their score calculated properly.

What is the expected behavior?

If the score can not be calculated, it should throw an error or warning. Otherwise, it should calculate and save the performance score properly.

Result of the report: https://api.jsonbin.io/b/5e7a162079d7e24dd30e365d report: https://googlechrome.github.io/lighthouse/viewer/?gist=d3b79a47e01590171bd7536f2980c145

package.json

{
  "version": "1.1.1",
  "main": "build/server.js",
  "private": true,
  "license": "MIT",
  "scripts": {
  },
  "engines": {
    "node": "^12.9.1"
  },
  "lint-staged": {
    "*.{js,jsx,ts,tsx}": "eslint"
  },
  "husky": {
    "hooks": {
      "pre-commit": "pretty-quick --staged && lint-staged"
    }
  },
  "devDependencies": {
    "@typescript-eslint/eslint-plugin": "^2.15.0",
    "@typescript-eslint/parser": "^2.15.0",
    "cross-env": "^5.2.1",
    "devtools-protocol": "0.0.692805",
    "eslint": "^6.8.0",
    "eslint-config-prettier": "^6.9.0",
    "eslint-config-standard": "^14.1.0",
    "eslint-plugin-import": "^2.19.1",
    "eslint-plugin-node": "^10.0.0",
    "eslint-plugin-prettier": "^3.1.2",
    "eslint-plugin-promise": "^4.2.1",
    "eslint-plugin-standard": "^4.0.1",
    "husky": "^3.1.0",
    "lint-staged": "^9.5.0",
    "prettier": "^1.19.1",
    "pretty-quick": "^1.11.1",
    "ts-node": "^8.5.4",
    "typescript": "^3.7.4"
  },
  "dependencies": {
    "@types/bluebird": "^3.5.29",
    "@types/puppeteer": "^1.20.3",
    "@types/request": "^2.48.4",
    "@types/request-promise": "^4.1.45",
    "aws-sdk": "^2.600.0",
    "bluebird": "^3.7.2",
    "express": "^4.17.1",
    "fs-extra": "^8.1.0",
    "interval-promise": "^1.3.0",
    "lighthouse": "^6.0.0-beta.0",
    "puppeteer": "^1.20.0",
    "request": "latest",
    "request-promise": "^4.2.5"
  }
}