Are std.dev calculated correctly ?

[tonythomas01]

Checking at the webkit test case - https://trac.webkit.org/browser/trunk/Tools/Scripts/webkitpy/benchmark_runner/benchmark_results_unittest.py?rev=216117#L42 -- I see that the stdev should be a percentage (out of 100). What we have now is a fraction like 0.0704225352113 in:

{'name': SpeedometerExample, 'metric': Time\Total, 'value': 674.22, 'stdev': 0.098284410446}

Well, it wont hurt much to process and display the round(obj.stdev*100, 2) during runtime, but this seems to be a calculation which can be pushed to the bot data processing code to save on load time.