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Revise Action API (#42940)

This updates the Action API in accordance with the design doc for the changes: flutter.dev/go/actions-and-shortcuts-design-revision

Fixes #53276
G
Greg Spencer committed
0f68b46f6a7b36691e74144908b494d069ff866e
Parent: c663cd5
Committed by GitHub <noreply@github.com> on 4/7/2020, 11:49:39 PM