[added] named exports for IndefiniteObservable and wrapWithObserver

Authored by appsforartists on Dec 5 2018, 11:35 PM.

Description

[added] named exports for IndefiniteObservable and wrapWithObserver

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

Tags: Material Motion

Differential Revision: http://codereview.cc/D3495