Description
        This test validates that the performance.mark() method is working properly. This test creates the
           following marks to test this method:
            
                - "mark1": created using a normal mark() call
- "mark1": duplicate of the first mark, used to confirm names can be re-used
After creating each mark, the existence of these marks is validated by calling
           performance.getEntriesByName() (both with and without the entryType parameter provided),
           performance.getEntriesByType(), and performance.getEntries()