#NEWLINE# def Union( self , mask1 , mask2 ) : #NEWLINE# #INDENT# 'Merges mask1 and mask2 into this FieldMask.' #NEWLINE# _CheckFieldMaskMessage ( mask1 ) #NEWLINE# _CheckFieldMaskMessage ( mask2 ) #NEWLINE# tree = _FieldMaskTree ( mask1 ) #NEWLINE# tree . MergeFromFieldMask ( mask2 ) #NEWLINE# tree . ToFieldMask ( self )