Update benchmarks to handle cog workflows

    """Remove the out directory."""

    def remove_out():

        out_dir = utils.get_out_dir()

        #only remove actual contents, in case out is a symlink (as is the case for cog)

        if os.path.exists(out_dir):

            shutil.rmtree(out_dir)

          for filename in os.listdir(out_dir):

              p = os.path.join(out_dir, filename)

              if os.path.isfile(p) or os.path.islink(p):

                  os.remove(p)

              elif os.path.isdir(p):

                  shutil.rmtree(p)

    return Change(label="Remove out", change=remove_out, undo=lambda: None)

def get_root():

    top_dir = os.environ.get("ANDROID_BUILD_TOP")

    if top_dir:

        return pathlib.Path(top_dir).resolve()

    d = pathlib.Path.cwd()

    # with cog, someone may have a new workspace and new source tree top, but

    # not run lunch yet, resulting in a misleading ANDROID_BUILD_TOP value

    if top_dir and d.is_relative_to(top_dir):

        return pathlib.Path(top_dir).resolve()

    while True:

        if d.joinpath("build", "soong", "soong_ui.bash").exists():

            return d.resolve().absolute()