code: protected void init() {
  		getMobileUserAgentPrefixes().addAll(
  				Arrays.asList(KNOWN_MOBILE_USER_AGENT_PREFIXES));
  		getMobileUserAgentKeywords().addAll(
  				Arrays.asList(KNOWN_MOBILE_USER_AGENT_KEYWORDS));
  		getTabletUserAgentKeywords().addAll(
  				Arrays.asList(KNOWN_TABLET_USER_AGENT_KEYWORDS));
  	}
docs: Initialize this device resolver implementation. Registers the known set of device
  signature strings. Subclasses may override to register additional strings.