TOKYO (Reuters) - Asian shares inched up in subdued trade on Thursday after Wall Street ended higher, but political uncertainty in the United States and worries about weakening global economic growth kept many investors on the sidelines.Financial spreadbetters expect London's FTSE Frankfurt's DAX and Paris's CAC to dip marginally when they open, with investors awaiting news from the European Central Bank's first policy review of the year.MSCI's broadest index of Asia-Pacific shares outside..