Chrome Version: (copy from chrome://version)
OS: Crome/57.0.2987
What steps will reproduce the problem?
(1) Using an packaged app which creates one more multiple windows which has a script tag.
(2) Attaching a remote debugger to the app.

What is the expected result?
To be able to see the source code for the window's javascript files and to be able to debug it, like setting break points.

What happens instead?
The script file is not listed among the sources for the window.

Sometimes when creating multiple windows which all use the same script file, the file shows up as a source for one of the windows but never for all of them.