React 15.4.0's performance profiling `react_perf` URL param doesn't work with Storybook

[mnquintana]

React 15.4.0 introduced a way to profile components in the Timeline tab of Chrome DevTools with a new URL param, react_perf – I tried passing this to the storybook playground, but it doesn't seem to be passed down to the iframe components get loaded in. Is there a way to pass this param?

Steps to Reproduce

1. Append ?react_perf to your local storybook server URL (e.g. localhost:6006/?react_perf) and visit that URL in a browser
2. Open up DevTools, and record a Timeline of some action you want to profile (e.g. scrolling)

Expected

The Timeline view contains a User Timing label that shows the timeline of each component's updates.

Actual

There is no User Timing label in the timeline view.

Let me know if there's any more info you need! I'd also be happy to submit a PR to add support for this if you can point me in the right direction.

[arunoda]

Yep. This is something we need to fix.

[arunoda]

@mnquintana I try to do a fix here: #623
Since we render react-components in a iframe, I'm not sure it's getting that or not.

Could you check whether this works or not.
Try to play with that.