There is any technical reason for the new Airbus shades?
It's not just for the looks. The A350 is the first Airbus ever to feature curved cocpit windows to reduce drag, and according to Airbus, the black "mask" contributes to ease of maintenance and harmonization of the thermal condition of the windows:


  "The perfectly curved shape of the nose helps the air flow hug the surface, in the least turbulent manner, thereby reducing drag. The emblematic “Ray-Ban” like black windshield eases the window’s maintenance and contributes to harmonising the thermal condition of this temperature-sensitive window area. ..."


Virgin Atlantic blog - Why does the Airbus A350 wear a Zorro mask?