Add PiP test for WindowLayoutComponent

Add a test to check that features before entering PiP are the same as
features after exiting PiP.

Bug:239389499
Test: atest CtsWindowManagerJetpackTestCases
Change-Id: I2e9bcd7a6571beda168301c63fd45292b59961cd
Merged-In: I2e9bcd7a6571beda168301c63fd45292b59961cd
12 files changed