Testing that timeline start and stop events have timestamps and are ordered reasonably.

PASS: 1st CapturingStarted had startTime
PASS: 1st CapturingStopped had endTime
PASS: 1st CapturingStopped had endTime > 1st CapturingStarted
PASS: 2nd CapturingStarted had startTime > 1st CapturingStarted
PASS: 2nd CapturingStarted had startTime > 1st CapturingStopped
PASS: 2nd CapturingStopped had endTime > 1st CapturingStopped
PASS: 2nd CapturingStopped had endTime > 2nd CapturingStarted