Tests CDP Emulation.addScreen() API with getScreenDetails().
Screen
 label='1st'
 0,0 800x600
 avail=0,0 800x600
 isPrimary=true
 isExtended=true
 isInternal=false
 colorDepth=24
 devicePixelRatio=1
 orientation.type=landscape-primary
 orientation.angle=0
Screen
 label='2nd'
 800,0 600x800
 avail=800,0 600x800
 isPrimary=false
 isExtended=true
 isInternal=false
 colorDepth=24
 devicePixelRatio=1
 orientation.type=landscape-primary
 orientation.angle=0