Does Tensorflow support a Decision Tree Classifier?
Basically I guess TensorFlow does not support decision trees. I quote from here, 


  This is a big oversimplification, but there are essentially two types of machine learning libraries available today, Deep learning
  (CNN,RNN, fully connected nets, linear models) and Everything else
  (SVM, GBMs, Random Forests, Naive Bayes, K-NN, etc). The reason for
  this is that deep learning is much more computationally intensive than
  other more traditional training methods, and therefore requires
  intense specialization of the library (e.g., using a GPU and
  distributed capabilities). If you're using Python and are looking for
  a package with the greatest breadth of algorithms, try scikit-learn.
  In reality, if you want to use deep learning and more traditional
  methods you'll need to use more than one library. There is no
  "complete" package.


You can see from here that there are other learning algorithms implemented in TensorFlow which are not deep models. 

You can take a look at here for tracking algorithms implemented in TensorFlow.