Update gentest to new api
Update gentest to new api

Summary: Update gentest to handle new CSSEdge api

Reviewed By: IanChilds

Differential Revision: D3770906

fbshipit-source-id: 1fa978354209fb8f4d0c5a2f892e1c79b062d4de

yihuang/css-layout,facebook/yoga,facebook/yoga,yihuang/css-layout,facebook/css-layout,facebook/yoga,yihuang/css-layout,facebook/yoga,facebook/css-layout,facebook/css-layout,facebook/yoga,yihuang/css-layout,rmarinho/yoga,facebook/yoga,facebook/yoga,facebook/css-layout,yihuang/css-layout,facebook/css-layout,rmarinho/yoga,facebook/css-layout,facebook/css-layout,rmarinho/yoga,facebook/yoga,facebook/css-layout,rmarinho/yoga,yihuang/css-layout,rmarinho/yoga,yihuang/css-layout,facebook/yoga,yihuang/css-layout,rmarinho/yoga,rmarinho/yoga,rmarinho/yoga,facebook/css-layout,facebook/yoga,rmarinho/yoga,yihuang/css-layout,yihuang/css-layout,rmarinho/yoga