Puppeteer support

[guybedford]

This would need to be supported as its own emission case, inlining the logic from lib/Launcher.js:

const browserFetcher = new BrowserFetcher(this._projectRoot);
...
browserFetcher.revisionInfo(this._preferredRevision);

where this._preferredRevision comes from the package.json file in node_modules/puppeteer-core/package.json puppeteer.chrome_revision property.

The internal logic of BrowserFetcher then does a join on the metadata to construct the path of the form - ${base}${os}-${revision} where base is node_modules/puppeteer/.local-chromium. Simply emitting this folder would be sufficient for support.