Support back gesture on trackpad

TODO: change back animation API to consider trackpad events

Bug: 255697805
Test: https://recall.googleplex.com/projects/3388b17c-d22f-46f8-b140-a102690377b4/sessions/3f751251-07f2-4cce-b577-474746bf4eab
Change-Id: I50963a3a495c9f2069bdc9e2a8606bb403b51f1c
8 files changed