def __init__(self, from_wrapper_script):
    self._parser = None
    self._from_wrapper_script = from_wrapper_script
    self.args = None
    self.apk_helper = None
    self.install_dict = None
    self.devices = None
    # Do not support incremental install outside the context of wrapper scripts.
    if not from_wrapper_script:
      self.supports_incremental = False