Create a new cookie whose path and domain are same with those of current page
under test, unless you specified a path for this cookie explicitly.
Arguments:
nameValuePair -
name and value of the cookie in a format "name=value"
optionsString -
options for the cookie.
Currently supported options include 'path' and 'max_age'.
the optionsString's format is "path=/path/, max_age=60".
The order of options are irrelevant, the unit
of the value of 'max_age' is second.
