feat(chromium): roll Chromium to r669486

[aslushnikov]

This roll includes:

• https://crrev.com/c/1589672/ - Include retired instruction delta in TraceEvents

[JoelEinbinder]

I’m not sure what that is. Are we going to turn it on?

[aslushnikov]

+cc @ai @mbalabash

This rolls in a new Chromium into Puppeteer that supports retired instruction counter on Linux (other platforms are not supported yet).

More context: https://twitter.com/aslushnikov/status/1121816765518897152

Once this lands, you'll be able to record a trace with RTI like this:

const puppeteer = require('puppeteer');
(async () => {
  const browser = await puppeter.launch({
    // --no-sandbox is needed so that renderer process has access to RTI
    args: [ '--enable-thread-instruction-count', '--no-sandbox'],
  });
  const page = await browser.newPage();
  await page.tracing.start({path: './trace.json'});
  // run scenario
  await page.goto('https://example.com');
  // ...
  await page.tracing.stop();
  await browser.close();
}();

The resulting trace has a new 'tidelta' parameter that contains RTI.

@JoelEinbinder: I hope this answers your question too!

[aslushnikov]

Thank you @acomminos for your hard work exposing RTI and landing patches to Chromium! 🎉