Fix source for PiP hover accessibility events

The events were ending up not important for a11y and
with invalid window ids, which prevented TalkBack from
seeing them properly.

Bug: 64428961
Test: Ran YouTube in PiP, now able to select it.
Change-Id: I38ccbf5f2f35ffda255b84f229e98ca23e6b11aa
2 files changed