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Add a11y support for selected text (#14254)

Framework side for https://github.com/flutter/engine/pull/4584 & https://github.com/flutter/engine/pull/4587.

Also rolls engine to 4c82c566edf394a5cfc237a266aea5bd37a6c172.
M
Michael Goderbauer committed
34ff00a75219773ac5288bacfe6b937ebd9db8ca
Parent: 97b9579
Committed by GitHub <noreply@github.com> on 1/25/2018, 6:12:02 PM