Add test for Im2ColMobileFunctor.
Add test for Im2ColMobileFunctor.

PaddlePaddle/Paddle,putcn/Paddle,lcy-seso/Paddle,jacquesqiao/Paddle,jacquesqiao/Paddle,QiJune/Paddle,baidu/Paddle,baidu/Paddle,reyoung/Paddle,Canpio/Paddle,reyoung/Paddle,jacquesqiao/Paddle,luotao1/Paddle,baidu/Paddle,Canpio/Paddle,lcy-seso/Paddle,QiJune/Paddle,putcn/Paddle,chengduoZH/Paddle,pkuyym/Paddle,pkuyym/Paddle,pkuyym/Paddle,luotao1/Paddle,pkuyym/Paddle,tensor-tang/Paddle,QiJune/Paddle,Canpio/Paddle,lcy-seso/Paddle,PaddlePaddle/Paddle,luotao1/Paddle,lcy-seso/Paddle,PaddlePaddle/Paddle,luotao1/Paddle,PaddlePaddle/Paddle,QiJune/Paddle,Canpio/Paddle,luotao1/Paddle,jacquesqiao/Paddle,Canpio/Paddle,jacquesqiao/Paddle,putcn/Paddle,chengduoZH/Paddle,reyoung/Paddle,chengduoZH/Paddle,putcn/Paddle,Canpio/Paddle,QiJune/Paddle,reyoung/Paddle,chengduoZH/Paddle,putcn/Paddle,baidu/Paddle,putcn/Paddle,tensor-tang/Paddle,QiJune/Paddle,lcy-seso/Paddle,pkuyym/Paddle,reyoung/Paddle,tensor-tang/Paddle,reyoung/Paddle,Canpio/Paddle,luotao1/Paddle,jacquesqiao/Paddle,chengduoZH/Paddle,luotao1/Paddle,tensor-tang/Paddle,Canpio/Paddle,PaddlePaddle/Paddle,baidu/Paddle,PaddlePaddle/Paddle,pkuyym/Paddle,PaddlePaddle/Paddle,tensor-tang/Paddle,lcy-seso/Paddle