`SameSite` not set on cookies

[daveisfera]

Amplitude doesn't appear to be setting SameSite on cookies, so Chrome 80 appears to cause problems:
https://www.chromestatus.com/feature/5088147346030592

[haoliu-amp]

Thank you for letting us know. Do you get any errors on this?

[daveisfera]

Yes, the following:

A cookie associated with a cross-site resource at http://<URL>/ was set without the `SameSite` attribute. It has been blocked, as Chrome now only delivers cookies with cross-site requests if they are set with `SameSite=None` and `Secure`. You can review cookies in developer tools under Application>Storage>Cookies and see more details at https://www.chromestatus.com/feature/5088147346030592 and https://www.chromestatus.com/feature/5633521622188032.

[blazzy]

@daveisfera, The SDK now explicitly sets the SameSite flag to None by default. This can also be overridden to something like Lax or None if you prefer. We set it to Lax for our own application.