[DO NOT MERGE] Dump windowing mode in Winscope traces

To be used by Fass in Winscope to automatically detect pip transitions

Bug: 183993924
Test: Existing tests
Change-Id: I066982c9de104acd307b8b016bce167ae9765ac8
(cherry picked from commit 786fe1e12866513dedef9340e0f2319ec890dfc5)
1 file changed