dpkt is an extensive tool (written in Python) for parsing TCP traffic, which includes support for decoding packets involved in the SSL handshake. Another tool for running and decoding captures from Python is pypcapfile.
Note that for decoding SSL traffic including data, private keys need to be known. This is somewhat problematic for a third-party server you don't control such as Google, and significant effort is required to work around it. One such approach is to set up a proxy with a known private key to play man-in-the-middle (and install a self-signed CA into your local store to force the browser to accept it).
