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
 DOM APIs - a core set of web platform APIs used extensively in web applications-
 as well as six popular JavaScript frameworks: Ember.js, Backbone.js, jQuery,
 AngularJS, React, and Flight. Many of these frameworks are used on the most
 popular websites in the world, such as Facebook and Twitter. The performance of
 these types of operations depends on the speed of the DOM APIs, the JavaScript
 engine, CSS style resolution, layout, and other technologies.
 """
 
 import os
 
 from telemetry import benchmark
 from telemetry import page as page_module
 from telemetry.page import page_set
 from telemetry.page import page_test
+from telemetry.value import improvement_direction
 from telemetry.value import list_of_scalar_values
 
 
 class SpeedometerMeasurement(page_test.PageTest):
   enabled_suites = [
     'VanillaJS-TodoMVC',
     'EmberJS-TodoMVC',
     'BackboneJS-TodoMVC',
     'jQuery-TodoMVC',
     'AngularJS-TodoMVC',
@@ skipping 20 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,
+        improvement_direction=improvement_direction.DOWN))
 
     # 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,
+          improvement_direction=improvement_direction.DOWN))
 
 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