Summary:
Changelog: [Internal]
Add support for dynamic font size.
New class `ThreadStorage` is introduced, which is used to pass LayoutContext to `YogaLayoutableShadowNode::yogaNodeMeasureCallbackConnector`.
## Shortcoming
This implementation doesn't cause re-render, if user changes font size and comes to the app without restarting it, it will show old font size. I believe this is fine for now as most people set their font size before they use the app and keep the same setting for a long time.
Reviewed By: shergin
Differential Revision: D22043728
fbshipit-source-id: 7453d165c280a2f4bcb73f4ee6daf9e64b637ded
Samuel Susla