Sometimes when diagnosing a failure in a BF, it is hard to determine when exactly the failure happened - there may be missing log statements etc. In these situations, it would be helpful to have timestamps associated with the Javascript backtrace that gets outputted from the tests.

For example, in BF-24122 it's hard to tell when the assert.soon failed. Because it causes the process to terminate, we can make some assumptions from the log line below failed to load, but it would be nice to have a timestamp on the actual failure message.