React scroll views should group accessibility children
React scroll views should group accessibility children

Summary: If we don't group accessibility children, we can get into a state where the accessibility frame for our content lines up in such a way that VoiceOver doesn't know to scroll the scroll view, and instead jumps to the next piece of content (like the tab bar at the bottom)

Reviewed By: ikenwoo

Differential Revision: D14141532

fbshipit-source-id: 53b0971f494a39f0eba827e441a4cd9e08317663

facebook/react-native,myntra/react-native,exponentjs/react-native,javache/react-native,hammerandchisel/react-native,hoangpham95/react-native,exponent/react-native,exponent/react-native,pandiaraj44/react-native,javache/react-native,myntra/react-native,javache/react-native,janicduplessis/react-native,hammerandchisel/react-native,exponentjs/react-native,exponent/react-native,exponent/react-native,myntra/react-native,janicduplessis/react-native,exponentjs/react-native,pandiaraj44/react-native,arthuralee/react-native,javache/react-native,facebook/react-native,myntra/react-native,pandiaraj44/react-native,janicduplessis/react-native,hammerandchisel/react-native,javache/react-native,arthuralee/react-native,janicduplessis/react-native,janicduplessis/react-native,hoangpham95/react-native,hammerandchisel/react-native,facebook/react-native,exponent/react-native,hoangpham95/react-native,arthuralee/react-native,pandiaraj44/react-native,hammerandchisel/react-native,myntra/react-native,exponentjs/react-native,pandiaraj44/react-native,pandiaraj44/react-native,janicduplessis/react-native,exponent/react-native,janicduplessis/react-native,exponent/react-native,pandiaraj44/react-native,facebook/react-native,hoangpham95/react-native,facebook/react-native,hoangpham95/react-native,exponentjs/react-native,facebook/react-native,hoangpham95/react-native,exponent/react-native,javache/react-native,exponentjs/react-native,janicduplessis/react-native,javache/react-native,exponentjs/react-native,facebook/react-native,facebook/react-native,javache/react-native,facebook/react-native,myntra/react-native,hammerandchisel/react-native,hoangpham95/react-native,javache/react-native,myntra/react-native,myntra/react-native,myntra/react-native,arthuralee/react-native,arthuralee/react-native,hoangpham95/react-native,hammerandchisel/react-native,exponentjs/react-native,hammerandchisel/react-native,pandiaraj44/react-native