Do not request focus on PiP menu if IME is up

Do not request focus on PiP menu window explicitly which can conflict
with an active IME.

Flag: EXEMPT bugfix
Bug: 381024863
Video: http://recall/-/aaaaaabFQoRHlzixHdtY/ersOMXu1r6PSPBPzDFr3JR
Test: Manual test, tap on PiP window when IME is up, see Video
Test: Manual test, make sure a11y works properly
Change-Id: Ie65d7e7e7c3d113c53890c3aa5880e1b11eaed25