42342 Fix DropdownButton crash when hint and selectedItemBuilder are simultaneously defined (cla: yes, f: material design, framework, severe: crash)

42344 Add onVisible callback to snackbar. (a: accessibility, cla: yes, f: material design, framework, waiting for tree to go green)

42352 Add android.permission.WAKE_LOCK permission to abstract_method_smoke_test (cla: yes, team)

42353 Add –cache-sksl flag to drive and run (cla: yes, tool)

42354 Pass -Ddart.developer.causal_async_stacks=true to frontend_server invocations. (cla: yes, tool)

42360 Add smoke test for the new Android embedding (cla: yes, team, tool, waiting for tree to go green)