[engine] Allow supplying custom gn args through gn wrapper. #126197
Description
Is there an existing issue for this?
- I have searched the existing issues
- I have read the guide to filing a bug
Use case
using gn args that do not have their actual cli flags (yet)
Proposal
copy dart's solution:
python3 ./tools/gn --gn-args 'use_default_linux_sysroot=false'