Description
        This test validates that the performance.measure() method is working properly when navigation timing
           attributes are used in place of mark names. This test creates the following measures to test this method:
            
                - "measure_nav_start_no_end": created using a measure() call with a navigation timing attribute
                    provided as the startMark and nothing provided as the endMark
- "measure_nav_start_mark_end": created using a measure() call with a navigation timing attribute
                    provided as the startMark and a mark name provided as the endMark
- "measure_mark_start_nav_end": created using a measure() call with a mark name provided as the
                    startMark and a navigation timing attribute provided as the endMark
- "measure_nav_start_nav_end":created using a measure() call with a navigation timing attribute
                    provided as both the startMark and endMark
After creating each measure, the existence of these measures is validated by calling
           performance.getEntriesByName() with each measure name