Make piper of PipedReaderBuilder takes arguments
Make piper of PipedReaderBuilder takes arguments

Summary: Allow context to be passed into piper function

Reviewed By: volkhin

Differential Revision: D5684716

fbshipit-source-id: 693f0464fe28f8692d75901705a85a0a413a7bed

pietern/caffe2,sf-wind/caffe2,sf-wind/caffe2,Yangqing/caffe2,sf-wind/caffe2,davinwang/caffe2,sf-wind/caffe2,davinwang/caffe2,xzturn/caffe2,pietern/caffe2,xzturn/caffe2,davinwang/caffe2,Yangqing/caffe2,pietern/caffe2,Yangqing/caffe2,davinwang/caffe2,Yangqing/caffe2,pietern/caffe2,caffe2/caffe2,pietern/caffe2,Yangqing/caffe2,davinwang/caffe2,xzturn/caffe2,xzturn/caffe2,xzturn/caffe2,sf-wind/caffe2