def _SetDeveloperKey(self, developer_key):
    self.additional_headers['X-GData-Key'] = 'key=' + developer_key
consume() ahead until p==index; can't just set p=index as we must
dataset/ETHPy150Open acil-bwh/SlicerCIP/Scripted/attic/PicasaSnap/gdata/youtube/service.py/YouTubeService._SetDeveloperKey--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/antlr3/antlr3/streams.py/ANTLRStringStream.seek