[Media TTT] Add an undo callback to the interface for when a transfer

has succeeded. The callback will be invoked when the user presses the
undo button.

Bug: 203800643
Bug: 203800347
Test: verify `adb shell cmd statusbar media-ttt-chip-add-sender Device
TransferToReceiverSucceeded` shows a chip with an Undo button. Verify
tapping the undo button switches the chip to the loading state again.
Test: media.taptotransfer tests

Change-Id: I912caa4408badffaa7a8e19f04e89bafd5d9a8ad