Bernie Ecclestone has backed Michael Schumacher to extend his Formula 1 comeback.The seven-times World champion's existing three-year contract, after his ultra-successful first career that included a record-smashing 91 race wins, will end this season.The 43-year-old has faced criticism since returning from retirement in 2010 but at Monaco in 2012 he was back on pole and at Valencia last time out he finished on the podium.'DOING A GOOD JOB'And on Sunday, when the great German started the British GP from third place, F1 chief executive Ecclestone said: "He's doing a good job; he's third on the grid here - you can't ask for much more.Image Gallery!"Why shouldn't he stay another 10 years?" wondered the diminutive Briton, who thinks the presence on the grid of an F1 living legend is a good thing for his sport."If it was up to me, he would stay for ever," Ecclestone is quoted as saying by the German news agency SID.