Implement "invalidation" test

[spmonahan]

Invalidation is a test case that will measure performance after some action has happened. For example, roughly:

1. The page and components are loaded
2. A component is clicked <-- start measure here
3. The browser does some work
4. Next browser frame <-- end measure here

The idea behind this test is that, during their usage, components are likely to be frequently invalidated making this a good measure of how well they perform in practice.