Use isAggregatedVisible for pane events

When the pane title changes, the view may not be actually visible on screen.
Check parent visibility before sending a pane event.

Bug: 133131221
Test: manual check to ensure we don't receive title event, atest AccessibilityPaneTest
Change-Id: I8bad8f742cc3e8f4d906c2b6fe80a3516c900ef1
1 file changed