Test CPU profile timestamps are properly sorted.

process_name: 0 0.00/0.00
thread_name: 0 0.00/0.00
TracingStartedInPage: 100 0.00/0.00
Program: 200 1250.00/1300.00
FunctionCall: 420 2.00/50.00
JSFrame: 422 39.00/48.00
JSSample: 422 0.00/0.00
JSSample: 424 0.00/0.00
JSFrame: 426 6.00/6.00
JSSample: 426 0.00/0.00
JSSample: 428 0.00/0.00
JSSample: 430 0.00/0.00
JSFrame: 432 3.00/3.00
JSSample: 432 0.00/0.00
JSSample: 434 0.00/0.00
JSSample: 435 0.00/0.00
JSSample: 436 0.00/0.00
CpuProfile: 1500 0.00/0.00