(command.CommandList
  children: [
    (C {<git>} {<clone>} {<https> <Id.Lit_Colon ':'> <'//chromium.googlesource.com/chromium/src/build'>})
    (C {<mkdir>} {<tools>})
    (C {<cd>} {<tools>})
    (C {<git>} {<clone>} {<https> <Id.Lit_Colon ':'> <'//chromium.googlesource.com/external/gyp'>})
    (C {<cd>} {<..>})
    (C {<'build/linux/sysroot_scripts/install-sysroot.py'>} {<--arch>} {<i386>})
    (C {<'build/linux/sysroot_scripts/install-sysroot.py'>} {<--arch>} {<amd64>})
  ]
)