Ignore GestureStrip's events in MouseEventEater

Do not filter events targeted at GestureStrip or it's children in
MouseEventEater.

Fixes GF-2458.

Open-webOS-DCO-1.0-Signed-off-by: Jaakko Putaala <jaakko.putaala@palm.com>

Change-Id: I110542377205eeb528e3b2381918913e214d2ce4
Reviewed-on: https://g2g.palm.com/1708
Reviewed-by: Build Verification
Reviewed-by: Jaakko Putaala <jaakko.putaala@palm.com>
Tested-by: Jaakko Putaala <jaakko.putaala@palm.com>
Reviewed-by: Kimmo Leppala <kimmo.leppala@palm.com>
Reviewed-by: Teppo Pennanen <teppo.pennanen@palm.com>
Reviewed-by: Roger Stringer <roger.stringer@lge.com>