This change starts and stops IME tracing together with the other traces
gathered when the WinscopeTrace tile is used. The data is saved along
the other traces in /data/misc/wmtrace/.
Bug: 154348613
Bug: 167948910
Test: flash a device together with the other change in this topic
enable the WinscopeTrace tile and do some actions
disable the WinscopeTrace tile
do a bugreport and visualise contents in Winscope
or just check contents of /data/misc/wmtrace/ through adb
Change-Id: If0b16dd5c19aa8bb33174abe2fe242fc8e6bdd90