Added declarations for requestAnimationFrame and cancelAnimationFrame…
Added declarations for requestAnimationFrame and cancelAnimationFrame…

Summary:
…. Fixes #1967
Closes https://github.com/facebook/flow/pull/2320

Reviewed By: gabelevi

Differential Revision: D3762293

Pulled By: samwgoldman

fbshipit-source-id: b00cede2def306652fe08d40dc721ac0f33b8e00

facebook/flow,fletcherw/flow,mroch/flow,AprilArcus/flow,AgentME/flow,fletcherw/flow,facebook/flow,claudiopro/flow,nmote/flow,AgentME/flow,TiddoLangerak/flow,mroch/flow,nmote/flow,AprilArcus/flow,nmote/flow,AprilArcus/flow,jgrund/flow,facebook/flow,ForbesLindesay/flow,jeffmo/flow,JonathanUsername/flow,popham/flow,mroch/flow,jamesgpearce/flow,AgentME/flow,popham/flow,ForbesLindesay/flow,AprilArcus/flow,JonathanUsername/flow,samwgoldman/flow,TiddoLangerak/flow,nmote/flow,chenglou/flow,fletcherw/flow,MichaelDeBoey/flow,TiddoLangerak/flow,samwgoldman/flow,MichaelDeBoey/flow,JonathanUsername/flow,ForbesLindesay/flow,mroch/flow,gabelevi/flow,jamesgpearce/flow,samwgoldman/flow,facebook/flow,claudiopro/flow,gabelevi/flow,samwgoldman/flow,popham/flow,jamesgpearce/flow,jamesgpearce/flow,gabro/flow,fletcherw/flow,samwgoldman/flow,jeffmo/flow,nmote/flow,gabelevi/flow,mroch/flow,gabro/flow,chenglou/flow,facebook/flow,gabro/flow,JonathanUsername/flow,gabelevi/flow,gabro/flow,MichaelDeBoey/flow,samwgoldman/flow,popham/flow,MichaelDeBoey/flow,facebook/flow,facebook/flow,chenglou/flow,jamesgpearce/flow,claudiopro/flow,gabelevi/flow,mroch/flow,ForbesLindesay/flow,ForbesLindesay/flow,TiddoLangerak/flow,AgentME/flow,ylu1317/flow,jeffmo/flow,popham/flow,AprilArcus/flow,popham/flow,popham/flow,jgrund/flow,gabelevi/flow,TiddoLangerak/flow,mroch/flow,ylu1317/flow,chenglou/flow,jgrund/flow,chenglou/flow,nmote/flow,ForbesLindesay/flow,fletcherw/flow,jamesgpearce/flow,fletcherw/flow,ylu1317/flow,gabro/flow,jeffmo/flow,samwgoldman/flow,jeffmo/flow,AprilArcus/flow,nmote/flow,chenglou/flow,JonathanUsername/flow,claudiopro/flow,AgentME/flow,jeffmo/flow,claudiopro/flow,JonathanUsername/flow,jgrund/flow,gabelevi/flow,MichaelDeBoey/flow,jgrund/flow,ylu1317/flow,jamesgpearce/flow,ylu1317/flow,JonathanUsername/flow,gabro/flow,jgrund/flow