Added support for improvement_direction to relevant values, which is propogated to chartjson.

tools/perf/benchmarks/speedometer.py

 # Copyright 2014 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.
 
 """Apple's Speedometer performance benchmark.
 
 Speedometer measures simulated user interactions in web applications.
 
 The current benchmark uses TodoMVC to simulate user actions for adding,
 completing, and removing to-do items. Speedometer repeats the same actions using
@@ skipping 40 matching lines @@
           benchmarkClient._measuredValues.push(measuredValues);
           benchmarkClient._timeValues.push(measuredValues.total);
         };
         benchmarkClient.iterationCount = %d;
         startTest();
         """ % iterationCount)
     tab.WaitForJavaScriptExpression(
         'benchmarkClient._finishedTestCount == benchmarkClient.testsCount', 600)
     results.AddValue(list_of_scalar_values.ListOfScalarValues(
         page, 'Total', 'ms',
-        tab.EvaluateJavaScript('benchmarkClient._timeValues'), important=True))
+        tab.EvaluateJavaScript('benchmarkClient._timeValues'), important=True,
+        higher_is_better=False))
 
     # Extract the timings for each suite
     for suite_name in self.enabled_suites:
       results.AddValue(list_of_scalar_values.ListOfScalarValues(
           page, suite_name, 'ms',
           tab.EvaluateJavaScript("""
               var suite_times = [];
               for(var i = 0; i < benchmarkClient.iterationCount; i++) {
                 suite_times.push(
                     benchmarkClient._measuredValues[i].tests['%s'].total);
               };
               suite_times;
-              """ % suite_name), important=False))
+              """ % suite_name), important=False, higher_is_better=False))
 
 class Speedometer(benchmark.Benchmark):
   test = SpeedometerMeasurement
 
   def CreatePageSet(self, options):
     ps = page_set.PageSet(
         file_path=os.path.abspath(__file__),
         archive_data_file='../page_sets/data/speedometer.json',
         bucket=page_set.PUBLIC_BUCKET)
     ps.AddUserStory(page_module.Page(
         'http://browserbench.org/Speedometer/', ps, ps.base_dir,
         make_javascript_deterministic=False))
     return ps