Refactor BenchmarkResult.Add to take enum for data_type

tools/perf/benchmarks/kraken.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Runs Mozilla's Kraken JavaScript benchmark."""
 
 import os
 
 from telemetry import test
 from telemetry.core import util
 from telemetry.page import page_measurement
+from telemetry.page import result_data_type
 from telemetry.page import page_set
 
 
 def _Mean(l):
   return float(sum(l)) / len(l) if len(l) > 0 else 0.0
 
 
 class KrakenMeasurement(page_measurement.PageMeasurement):
   def MeasurePage(self, _, tab, results):
     js_is_done = """
 document.title.indexOf("Results") != -1 && document.readyState == "complete"
 """
     def _IsDone():
       return bool(tab.EvaluateJavaScript(js_is_done))
     util.WaitFor(_IsDone, 500, poll_interval=5)
 
     js_get_results = """
 var formElement = document.getElementsByTagName("input")[0];
 decodeURIComponent(formElement.value.split("?")[1]);
 """
     result_dict = eval(tab.EvaluateJavaScript(js_get_results))
     total = 0
     for key in result_dict:
       if key == 'v':
         continue
-      results.Add(key, 'ms', result_dict[key], data_type='unimportant')
+      results.Add(key, 'ms', result_dict[key], result_data_type.UNIMPORTANT)
       total += _Mean(result_dict[key])
     results.Add('Total', 'ms', total)
 
 
 class Kraken(test.Test):
   """Mozilla's Kraken JavaScript benchmark."""
   test = KrakenMeasurement
 
   def CreatePageSet(self, options):
     return page_set.PageSet.FromDict({
         'archive_data_file': '../data/kraken.json',
         'pages': [
           { 'url': 'http://krakenbenchmark.mozilla.org/kraken-1.1/driver.html' }
           ]
         }, os.path.abspath(__file__))