proposal: event communication #5854

Job	Run time
Build extensions	1m 18s
Test	2m 22s
ember-try (ember-lts-3.16)	3m 1s
ember-try (ember-lts-3.20)	2m 57s
ember-try (ember-lts-3.24)	2m 56s
ember-try (ember-lts-3.28)	1m 49s
ember-try (ember-release)	1m 17s
ember-try (ember-beta)	1m 18s
ember-try (ember-canary)	1m 32s
ember-try (ember-default-no-prototype-extensions)	1m 19s
Publish npm package	0s
Publish bookmarklet	0s
Publish Chrome extension	0s
Publish Firefox extension	0s
	19m 49s

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