Introduce FlagGroup.expandIfTrue, expandIfFalse

This cl adds support for expand_if_true and expand_if_false messages
to the flag_group, allowing more elegant design of build variables.
This cl also adds IntegerValue VariableValue subclass.

RELNOTES: NONE.
PiperOrigin-RevId: 140849578
1 file changed
tree: c6b6fb6c6f7beddc25279473312e32cb7abc12ff
  1. third_party/