iOS: expose onstart and beforetransition hook, create syncwaterfall js backed hook - #582

iOS: expose onstart and beforetransition hook, create syncwaterfall js backed hook#582

nancywu1 wants to merge 3 commits into

mainplayer-ui/player:mainfrom

ios-expose-before-transition-and-on-start-hookplayer-ui/player:ios-expose-before-transition-and-on-start-hookCopy head branch name to clipboard