Test: Build aosp with USE_RBE=1. Change-Id: I4b51fbde330c6129654aa74f8a58dccf62cfa11d
used in links. Test: Built aosp-arm64_eng with and without USE_RBE=1 Change-Id: I8d04069219a9467c3de9a028eb68e3115173f1e2
environment variables. Test: Built aosp_arm-user with and without USE_RBE. With USE_RBE, used a simple proxy script in place of rewrapper. Change-Id: Ifb6bfd9f7292346f4750a6a409aa0def4e3c0363