Vertical Display of leaves in org chart

This is in reference with [this](https://github.com/google/google-visualization-issues/issues/47) issue-enhancement in google-visualization. The org chart as of now display all the leaves horizontally. If the domain contains large number of data, the width becomes too broad. Can we have a feature to display it vertically also.

Start with the linked google-visualization issue 47 and inspect the repository's org-chart integration. Determine how a vertical leaf layout should be selected and verify that large org charts can display leaves vertically as well as horizontally. The issue names no files or tests, so the implementation path needs discovery.

Written by the indexing model from the issue text.