Fabric: Defined `+` and `*` operators for Point and Size geometric types
Fabric: Defined `+` and `*` operators for Point and Size geometric types

Summary:
@public
Trivial. Those operations are very useful in layout algorithms.

Reviewed By: mdvacca

Differential Revision: D9403566

fbshipit-source-id: e76967aaaac3a36bf6d3e7a468b5ae7769a4dcac

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