Update remote-shell protocol to 20

Bug: 119841340
Test: manually tested with all changes necessary.
 Fast ink still works and youtube can adjust its
 instes corectly in autohide state.
Change-Id: I4a639ad5ae8807c7704dd76fc16035b0f024a50a
(cherry picked from commit 8a71345857a1cf6dd4569b337b3013bf15da272a)