Experimental Event API: Press event properties

[trueadm]

This PR adds some Press responder event properties that are missing in relation to:

• clientX
• clientY
• screenX
• screenY
• pageX
• pageY
• timeStamp

We attempt to get these from the nativeEvent object, except in the case of delayed events, where we calculate the values based on nativeEvent's timeStamp value.

This PR depends on #15587.

[necolas]

Do you mind if we split this PR into separate PR's? The two changes aren't really related.

[sizebot]

Details of bundled changes.

Comparing: 51e66cf...78fce1a

react-events

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react-events.development.js	0.0%	-0.2%	1.16 KB	1.16 KB	617 B	616 B	UMD_DEV
react-events.development.js	0.0%	-0.2%	996 B	996 B	555 B	554 B	NODE_DEV
react-events-press.development.js	+6.9%	+5.8%	18.97 KB	20.27 KB	4.3 KB	4.55 KB	UMD_DEV
react-events-press.production.min.js	🔺+5.8%	🔺+5.5%	7.11 KB	7.52 KB	2.47 KB	2.61 KB	UMD_PROD
react-events-press.development.js	+6.9%	+5.8%	18.78 KB	20.08 KB	4.25 KB	4.49 KB	NODE_DEV
react-events-press.production.min.js	🔺+6.0%	🔺+5.6%	6.93 KB	7.34 KB	2.41 KB	2.54 KB	NODE_PROD
ReactEventsPress-dev.js	+9.8%	+7.6%	19.23 KB	21.11 KB	4.36 KB	4.69 KB	FB_WWW_DEV
ReactEventsPress-prod.js	🔺+10.8%	🔺+8.9%	16.33 KB	18.1 KB	3.32 KB	3.62 KB	FB_WWW_PROD
react-events-hover.development.js	0.0%	0.0%	8.4 KB	8.4 KB	2.05 KB	2.06 KB	UMD_DEV
react-events-hover.production.min.js	0.0%	-0.1%	3.57 KB	3.57 KB	1.32 KB	1.31 KB	UMD_PROD
react-events-hover.development.js	0.0%	-0.0%	8.22 KB	8.22 KB	2 KB	2 KB	NODE_DEV
react-events-hover.production.min.js	0.0%	-0.2%	3.4 KB	3.4 KB	1.26 KB	1.25 KB	NODE_PROD
react-events-focus.development.js	0.0%	-0.1%	5.96 KB	5.96 KB	1.56 KB	1.56 KB	UMD_DEV
react-events-focus.production.min.js	0.0%	-0.1%	2.67 KB	2.67 KB	1.04 KB	1.04 KB	UMD_PROD
react-events-focus.development.js	0.0%	-0.1%	5.77 KB	5.77 KB	1.5 KB	1.5 KB	NODE_DEV
react-events-focus.production.min.js	0.0%	-0.1%	2.48 KB	2.48 KB	981 B	980 B	NODE_PROD
react-events-focus-scope.development.js	0.0%	-0.1%	4.72 KB	4.72 KB	1.41 KB	1.41 KB	UMD_DEV
react-events-focus-scope.production.min.js	0.0%	-0.2%	1.96 KB	1.96 KB	977 B	975 B	UMD_PROD
react-events-focus-scope.development.js	0.0%	-0.2%	4.54 KB	4.54 KB	1.35 KB	1.35 KB	NODE_DEV
react-events-focus-scope.production.min.js	0.0%	-0.2%	1.77 KB	1.77 KB	891 B	889 B	NODE_PROD
react-events-swipe.production.min.js	0.0%	-0.1%	2.64 KB	2.64 KB	1.22 KB	1.22 KB	UMD_PROD
react-events-swipe.development.js	0.0%	-0.0%	7.87 KB	7.87 KB	2.37 KB	2.37 KB	NODE_DEV
react-events-swipe.production.min.js	0.0%	-0.1%	3.27 KB	3.27 KB	1.51 KB	1.51 KB	NODE_PROD
react-events-drag.development.js	0.0%	-0.1%	5.66 KB	5.66 KB	1.6 KB	1.6 KB	UMD_DEV
react-events-drag.production.min.js	0.0%	-0.2%	2.5 KB	2.5 KB	1.13 KB	1.13 KB	UMD_PROD
react-events-drag.development.js	0.0%	-0.0%	7.42 KB	7.42 KB	2.26 KB	2.26 KB	NODE_DEV
react-events-drag.production.min.js	0.0%	-0.1%	3.14 KB	3.14 KB	1.43 KB	1.43 KB	NODE_PROD

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