!! PRO TIPS !! You can also test them inside Chrome OS (will be reset upon a restart), to do that run the following commands on CrOS terminal:
sudo su
cp /etc/chrome_dev.conf /usr/local/
mount --bind /usr/local/chrome_dev.conf /etc/chrome_dev.conf
exit
Now, you can use vim editor to edit the file.
sudo vim /etc/chrome_dev.conf
What I did to put chrome flags directly on chrome os:
What I did to put chrome flags directly on chrome os: