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

tools/perf/benchmarks/spaceport.py

 # Copyright 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 spaceport.io's PerfMarks benchmark."""
 
 import logging
 import os
 
 from telemetry import benchmark
@@ skipping 68 matching lines @@
       logging.info('Completed test %d of %d' %
                    (num_results, num_tests_in_spaceport))
 
     result_dict = eval(tab.EvaluateJavaScript(
         'JSON.stringify(window.__results)'))
     for key in result_dict:
       chart, trace = key.split('.', 1)
       results.AddValue(scalar.ScalarValue(
           results.current_page, '%s.%s'% (chart, trace),
           'objects (bigger is better)', float(result_dict[key]),
-          important=False, description=DESCRIPTIONS.get(chart)))
+          important=False, description=DESCRIPTIONS.get(chart),
+          higher_is_better=True))
     results.AddValue(list_of_scalar_values.ListOfScalarValues(
         results.current_page, 'Score', 'objects (bigger is better)',
         [float(x) for x in result_dict.values()],
-        description='Combined score for all parts of the spaceport benchmark.'))
+        description='Combined score for all parts of the spaceport benchmark.',
+        higher_is_better=True))
 
 
 # crbug.com/166703: This test frequently times out on Windows.
 @benchmark.Disabled('mac', 'win')
 class Spaceport(benchmark.Benchmark):
   """spaceport.io's PerfMarks benchmark."""
   test = _SpaceportMeasurement
 
   def CreatePageSet(self, options):
     spaceport_dir = os.path.join(util.GetChromiumSrcDir(), 'chrome', 'test',
         'data', 'third_party', 'spaceport')
     ps = page_set.PageSet(file_path=spaceport_dir)
     ps.AddUserStory(page_module.Page('file://index.html', ps, ps.base_dir))
     return ps