add_cookie_with_first_party

Adds cookie to this.

Emits the [signal@CookieJar:SoupCookieJar:changed] signal if we are modifying an existing cookie or adding a valid new cookie ( 'valid' means that the cookie's expire date is not in the past).

first_party will be used to reject cookies coming from third party resources in case such a security policy is set in the this.

cookie will be 'stolen' by the jar, so don't free it afterwards.

For secure cookies to work properly you may want to use [method@CookieJar.add_cookie_full].

Parameters:

this	a CookieJar
first_party	the URI for the main document
cookie	a Cookie