Fix NullPointerException in OverviewInputConsumer

OverviewInputConsumer should wait until the root view is attached to the window before using the ViewRootImpl.

Flag: not needed
Fixes: 303117246
Test: used the OverviewInputConsumer with the keyboard
Change-Id: I78c23cb146f35cdb1f4b87f42726d6260d4a2b87
1 file changed