Adopt UIKit SPI added in <rdar://problem/44928156> to support Control + t and Control + k to transpose and delete to the end of the line/paragraph, respectively.
<rdar://problem/47743533>
Created attachment 361694 [details] Patch and layout tests
Created attachment 361695 [details] Patch and layout tests
Committed r241284: <https://trac.webkit.org/changeset/241284>