This error showed because DecorContext uses application context to get WindowManager. This CL changes to use PhoneWindow to obtain WindowManager instance. Also refactor ctr to obtain context from PhoneWindow. Bug: 152806048 Test: manual - enable strict mode and check the error log not shown. Test: atest DecorContextTest Test: atest MemoryTests#testActivityRecreation Change-Id: I1d416b9cdb015c9bc3553571041f3b14bb9da5da