React Scheduler - Initial commit

[flarnie]

This is the first step - pulling the ReactDOMFrameScheduling module out
into a separate package.

Will write more fullly about the movitations for this in follow-up PRs which add the more customized behavior.

[pull-bot]

Details of bundled changes.

Comparing: 5dfbfe9...88afff7

react-dom

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react-dom.development.js	+0.1%	+0.1%	609.28 KB	609.76 KB	140.41 KB	140.58 KB	UMD_DEV
react-dom.development.js	+0.1%	+0.1%	593.65 KB	594.14 KB	136.25 KB	136.42 KB	NODE_DEV
ReactDOM-dev.js	+0.1%	+0.1%	618.04 KB	618.53 KB	139.01 KB	139.17 KB	FB_DEV

react-art

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react-art.development.js	+0.1%	+0.2%	412.38 KB	412.86 KB	89.46 KB	89.64 KB	UMD_DEV
react-art.development.js	+0.1%	+0.3%	338.21 KB	338.7 KB	70.68 KB	70.86 KB	NODE_DEV
ReactART-dev.js	+0.1%	+0.3%	346.44 KB	346.92 KB	70.26 KB	70.45 KB	FB_DEV

react-scheduler

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react-scheduler.development.js	n/a	n/a	0 B	12.07 KB	0 B	4.17 KB	UMD_DEV
react-scheduler.production.min.js	n/a	n/a	0 B	1.83 KB	0 B	912 B	UMD_PROD
react-scheduler.development.js	n/a	n/a	0 B	11.88 KB	0 B	4.11 KB	NODE_DEV
react-scheduler.production.min.js	n/a	n/a	0 B	1.91 KB	0 B	927 B	NODE_PROD

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[aweary]

Does this supersede #12253? 👀

[acdlite]

@aweary Yeah, we decided on a new strategy. Perhaps @flarnie can share credit for this commit? She's copied some of your tests.

[aweary]

No credit needed, just wanted to know if I should go ahead and close #12253 now :)

[acdlite]

Thanks for your work on that!

[aweary]

Of course! @flarnie if supporting multiple scheduled callbacks is still a goal 4a5134f might be useful as a starting point. I think it's a ~mostly working implementation.

[flarnie]

Thanks @aweary and @acdlite - my bad, should have mentioned to you @aweary that I was picking up this work, and thanks for your original PR. Amending this to share credit.