Add tests of Chain.to_device, ChainList.to_chainerx, ChainList.to_device
Add tests of Chain.to_device, ChainList.to_chainerx, ChainList.to_device

keisuke-umezawa/chainer,hvy/chainer,jnishi/chainer,ktnyt/chainer,okuta/chainer,niboshi/chainer,wkentaro/chainer,chainer/chainer,jnishi/chainer,okuta/chainer,chainer/chainer,niboshi/chainer,hvy/chainer,wkentaro/chainer,ktnyt/chainer,okuta/chainer,jnishi/chainer,pfnet/chainer,wkentaro/chainer,keisuke-umezawa/chainer,tkerola/chainer,ktnyt/chainer,niboshi/chainer,okuta/chainer,chainer/chainer,chainer/chainer,keisuke-umezawa/chainer,keisuke-umezawa/chainer,jnishi/chainer,niboshi/chainer,wkentaro/chainer,ktnyt/chainer,hvy/chainer,hvy/chainer