*** Reason for rollforward ***
Rollforward after making sure the handler is created,
and that a test is written preventing a
similar regression.
*** Original change description ***
Rollback of b6f5a263f7
*** Original commit ***
Rollforward of commit 5612ac50a332e425dc130c3c13a139b9e6fce9ec.
*** Reason for rollforward ***
Rollforward after making sure the handler is created
from the playback thread and not from an app thread.
*** Original change description ***
Rollback of e1beb1d194
*** Original commit ***
PiperOrigin-RevId: 318274400
e386b0b00a