I found the way to test it.
These are the steps I had to follow
- Install a ppa with a more recent chromium version, from here:
http://www.webupd8.org/2012/09/new-chromium-stable-and-development.html
sudo add-apt-repository ppa:a-v-shkop/chromium-dev
sudo apt-get update
sudo apt-get install chromium-browser
as of today it install Version 27.0.1453.6 Ubuntu 13.04 (191032)
Open the browser and in the url bar enter chrome://flags/
enabled "Enable Developer Tools experiments."
restart the browser
open the web page you want to debug using workspaces
press F12 to open the dev tool
press F1 to open the settings panel
go to Experiments and check "File system folders in Sources Panel"
restart browser
in your file system, add a file named .allow-devtools-edit
cd
touch .allow-devtools-edit
once again, press F12, F1, and select Workspace, add folder, and add the root of your project
to map your web site to your file system, right click on any js file and select 'Map to network resource', then choose the corresponding file
and that's it, in the Workspace section of your Settings, you will see that a mapping has been added, with something like
'http://localhost:9000' -> '/home/opensas/dev/apps/my_js_project'
The good news is that it seems that with the latest Google Chrome development version everything works out of the box, no need to mess around with development or experimental features.