Add npm task for libchromiumcontent build and bootstrap
Add npm task for libchromiumcontent build and bootstrap

Auditors: 3b7c71ee0e5cc446e346f75e333ddae4d394475d@bridiver

brave/electron,brave/muon,brave/electron,brave/muon,brave/electron,posix4e/electron,brave/muon,brave/muon,brave/muon,posix4e/electron,brave/electron,brave/electron,brave/muon,posix4e/electron,posix4e/electron,brave/electron,posix4e/electron,posix4e/electron