[added] dimensions$ support to combineStyleStreams + fixed some types

Authored by appsforartists on Aug 22 2018, 10:12 PM.

Description

[added] dimensions$ support to combineStyleStreams + fixed some types

Summary:
Added an easy way to merge width and height into combineStyleStreams.

As part of this, I used csstype for return value typings, and added support for Partial<Point2D> to translate$.

Reviewers: O2 Material Motion, O3 Material JavaScript platform reviewers, Material Motion

Tags: Material Motion

Differential Revision: http://codereview.cc/D3453