Supports interactive exploration of a simplified TraceMalloc snapshot.
Left-click to zoom in on a box, and right-click to zoom out.
This page displays the data found in ./json-treemap-data.js,
which is built by running blame-map.rb on a TraceMalloc snapshot.
Modify $blame_list in blame-map.rb to control the granularity,
and Config.levelsToShow in treemap.js to change how much of the tree is displayed.