Test instructions:
After clicking the run test button, the test will record 100
measurements from performance.now(). Clamping of this
API is tied to the brave://flags/#brave-round-time-stamps feature flag.
When the flag is enabled, these should all be integers and the tests
should pass. When the flag is disabled there should be a mix of integers and float values and the tests should fail.
The test will also summarize the findings for you too.