Make access to SourceCode Native Extension lazy
Make access to SourceCode Native Extension lazy

Reviewed By: fromcelticpark

Differential Revision: D6987478

fbshipit-source-id: 6d600131239be34480bd1c5a0ca84b4fab360386

javache/react-native,hoangpham95/react-native,janicduplessis/react-native,pandiaraj44/react-native,exponentjs/react-native,facebook/react-native,janicduplessis/react-native,myntra/react-native,exponentjs/react-native,arthuralee/react-native,facebook/react-native,hoangpham95/react-native,hoangpham95/react-native,hammerandchisel/react-native,javache/react-native,arthuralee/react-native,exponent/react-native,myntra/react-native,janicduplessis/react-native,exponentjs/react-native,facebook/react-native,myntra/react-native,hammerandchisel/react-native,facebook/react-native,facebook/react-native,javache/react-native,arthuralee/react-native,exponent/react-native,facebook/react-native,janicduplessis/react-native,pandiaraj44/react-native,myntra/react-native,myntra/react-native,hoangpham95/react-native,janicduplessis/react-native,exponent/react-native,facebook/react-native,facebook/react-native,hoangpham95/react-native,janicduplessis/react-native,javache/react-native,pandiaraj44/react-native,hammerandchisel/react-native,exponent/react-native,javache/react-native,hoangpham95/react-native,exponent/react-native,myntra/react-native,javache/react-native,myntra/react-native,pandiaraj44/react-native,hoangpham95/react-native,exponentjs/react-native,javache/react-native,exponentjs/react-native,hoangpham95/react-native,arthuralee/react-native,exponent/react-native,janicduplessis/react-native,hammerandchisel/react-native,arthuralee/react-native,myntra/react-native,pandiaraj44/react-native,hammerandchisel/react-native,myntra/react-native,exponentjs/react-native,javache/react-native,exponent/react-native,pandiaraj44/react-native,pandiaraj44/react-native,hammerandchisel/react-native,hammerandchisel/react-native,janicduplessis/react-native,pandiaraj44/react-native,exponentjs/react-native,hammerandchisel/react-native,facebook/react-native,exponent/react-native,javache/react-native,exponentjs/react-native