We now ignore files imported from WPT, if they are in the root `common`
directory, or any directory named `resources`. This matches the
behavior of the WPT test harness.
Some tests take longer than others, and so may want to set a custom
timeout so that they pass, without increasing the timeout for all other
tests. For example, this is done in WPT.
Add an `internals.setTestTimeout(milliseconds)` method that overrides
the test runner's default timeout for the currently-run test.
This adds a verbosity option to log the start and end of each test, with
the duration taken for the test. To be able to use this option with our
exisiting verbosity flag, without cluttering stdout with other data, we
add verbosity levels to headless-browser. The level is increased by
providing the -v flag on the command line multiple times.
We now skip so many tests that the list of skipped tests exceeds the
height of my terminal. Let's skip logging these by default, as it is
too noisy to find actually relevant information.
