`Grid` (and its HOCs `FlexTable` and `VirtualScroll`) now support larger heights and widths than browsers support natively.
For example, the current version of Chrome will not allow users to scroll pass ~33.5M pixel offset.
To work around this limitation, `Grid` increases the density of cells, shifting them as a ratio of what the full scrollable size would be to a browser-safe size.
This should be more or less transparent to users, although in extreme cases it can lead to _really sensitive_ scroll responsiveness.
