Support moving and resizing freeform windows

Instead of an InputMonitor for the entire display, we use window
decoration surface to monitor window resizing gestures. This allows us
to consolidate hit test to InputFlinger.

There is an issue that gesture monitor for gesture nav steals touches
from the resize window while resizing if user moves pointers too fast.

Bug: 165794880
Test: Drag resize works.
Change-Id: I2685e074dd02af55928d20a93f7c0690cc498fc5