Map bundled files back to their original files when sourcemap is present

[imjching]

Here's a sample profile for https://perf-demo.firebaseapp.com/?react_perf.

In perf.html, we see that functions are mapped to the bundled JavaScript file with its corresponding line number.

It would be great to show the original file if a sourcemap of that specific file is found.

Here's what we have in Google Chrome's DevTools:

┆Issue is synchronized with this Jira Task

[julienw]

Thanks, yeah this is something we want to do -- funnily it wasn't on file yet.

[fqueze]

See also issue #605