Coinbase currently exchanges Bitcoin, Bitcoin Cash, Ethereum, and Litecoin for fiat. You can't trade between cryptocurrencies.
However, I would not expect that to be the case by the end of the year. My guess is that they end up doubling their coin offerings, if not more than that. At the very least, Ripple, Cardano, NEO, and Monero all seem like likely coins that Coinbase will support in the not-too-distant future.
I also suspect they will roll out inter-crypto trading at some point. So they can compete with the functionality of regular exchanges like Bittrex, Binance, Bitfinex, etc.
All of that said, I don't think that CoinTracking and Coinbase have any partnership opportunities on the horizon. One of the things that makes CoinTracking great is its ability to connect via API to almost all major exchanges. If they partnered with Coinbase, I'd worry that that freedom to gather all the information that's out there would be compromised.