Expand PiP with the letterbox bounds

When expand from PiP to full-screen mode, take account also the
letterbox information from the AppCompat

Note: we still need to polish this particular CUJ, this change makes
sure the experience is close to PiP1

Flag: com.android.wm.shell.enable_pip2
Bug: 377362511
Video: PiP1 http://recall/-/aaaaaabFQoRHlzixHdtY/hMUeZbxmAFIvRndeu5qDvT
Video: PiP2 http://recall/-/aaaaaabFQoRHlzixHdtY/hPPkheAQzbRPUGSAgf5qYf
Test: Enter PiP from Tangorpro portrait mode, see Videos
Change-Id: Ibb69753b5faa22d7017126abb07104b94006ff4a