[Fizz] Add another fixture

[gaearon]

This adds another fixture I'm using to play with Streaming HTML and Selective Hydration.

[sizebot]

Comparing: cc4d24a...426af88

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.min.js	=	127.29 kB	127.29 kB	=	40.81 kB	40.81 kB
oss-experimental/react-dom/cjs/react-dom.production.min.js	=	130.11 kB	130.11 kB	=	41.75 kB	41.75 kB
facebook-www/ReactDOM-prod.classic.js	=	404.72 kB	404.72 kB	=	74.90 kB	74.90 kB
facebook-www/ReactDOM-prod.modern.js	=	393.27 kB	393.27 kB	=	73.09 kB	73.09 kB
facebook-www/ReactDOMForked-prod.classic.js	=	404.72 kB	404.72 kB	=	74.90 kB	74.90 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

Generated by 🚫 dangerJS against 426af88