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Warn user when attempting to switch modes without cookies

Authored by Theopolisme.

Description

Warn user when attempting to switch modes without cookies

If user has JavaScript enabled, we'll attempt to check and/or set
a test cookie using JavaScript and show a toast if the user's browser
doesn't support cookies.

Bug: 51277
Change-Id: Iaa61dee1a285249ba662f935dd257ebdfc8ca10d