Nothing in the wiki or in expert takes supports any Christian Gonzalez-to-the-Cowboys or -Giants trade rumors. The Patriots' Pro Bowl cornerback (from the Christian Gonzalez page) is firmly in the middle of a contract extension saga — he's seeking $35M+/year, the Patriots have called re-signing him a "top priority," and Gonzalez himself has reaffirmed his commitment to the team.
If you're seeing this buzz elsewhere on social media or from fan chatter, it's likely speculative rather than sourced. The Cowboys need corner help in Christian Parker's new scheme, and the Giants have an open competition on the right side of their secondary — but there's zero reporting suggesting either team is actually pursuing a trade for Gonzalez.