Set up the win_toolchain directory when updating, if needed
Set up the win_toolchain directory when updating, if needed

Pull in environment variables from env.bat

deepak1556/libchromiumcontent,electron/libchromiumcontent,hokein/libchromiumcontent,eric-seekas/libchromiumcontent,eric-seekas/libchromiumcontent,jlord/libchromiumcontent,synaptek/libchromiumcontent,paulcbetts/libchromiumcontent,bbondy/libchromiumcontent,zhanggyb/libchromiumcontent,bbondy/libchromiumcontent,electron/libchromiumcontent,brave/libchromiumcontent,jlord/libchromiumcontent,zhanggyb/libchromiumcontent,atom/libchromiumcontent,brave/libchromiumcontent,deepak1556/libchromiumcontent,adamjgray/libchromiumcontent,hokein/libchromiumcontent,synaptek/libchromiumcontent,paulcbetts/libchromiumcontent,adamjgray/libchromiumcontent,atom/libchromiumcontent