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

tools/telemetry/telemetry/results/page_run_unittest.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.
 
 import os
 import unittest
 
 from telemetry import page as page_module
 from telemetry.page import page_set
 from telemetry.results import page_run
 from telemetry.value import failure
+from telemetry.value import improvement_direction
 from telemetry.value import scalar
 from telemetry.value import skip
 
 
 class PageRunTest(unittest.TestCase):
   def setUp(self):
     self.page_set = page_set.PageSet(file_path=os.path.dirname(__file__))
     self.page_set.AddUserStory(page_module.Page(
         'http://www.bar.com/', self.page_set, self.page_set.base_dir))
 
   @property
   def pages(self):
     return self.page_set.pages
 
   def testPageRunFailed(self):
     run = page_run.PageRun(self.pages[0])
     run.AddValue(failure.FailureValue.FromMessage(self.pages[0], 'test'))
     self.assertFalse(run.ok)
     self.assertTrue(run.failed)
     self.assertFalse(run.skipped)
 
     run = page_run.PageRun(self.pages[0])
-    run.AddValue(scalar.ScalarValue(self.pages[0], 'a', 's', 1))
+    run.AddValue(scalar.ScalarValue(
+        self.pages[0], 'a', 's', 1,
+        improvement_direction=improvement_direction.DOWN))
     run.AddValue(failure.FailureValue.FromMessage(self.pages[0], 'test'))
     self.assertFalse(run.ok)
     self.assertTrue(run.failed)
     self.assertFalse(run.skipped)
 
   def testPageRunSkipped(self):
     run = page_run.PageRun(self.pages[0])
     run.AddValue(failure.FailureValue.FromMessage(self.pages[0], 'test'))
     run.AddValue(skip.SkipValue(self.pages[0], 'test'))
     self.assertFalse(run.ok)
     self.assertFalse(run.failed)
     self.assertTrue(run.skipped)
 
     run = page_run.PageRun(self.pages[0])
-    run.AddValue(scalar.ScalarValue(self.pages[0], 'a', 's', 1))
+    run.AddValue(scalar.ScalarValue(
+        self.pages[0], 'a', 's', 1,
+        improvement_direction=improvement_direction.DOWN))
     run.AddValue(skip.SkipValue(self.pages[0], 'test'))
     self.assertFalse(run.ok)
     self.assertFalse(run.failed)
     self.assertTrue(run.skipped)
 
   def testPageRunSucceeded(self):
     run = page_run.PageRun(self.pages[0])
     self.assertTrue(run.ok)
     self.assertFalse(run.failed)
     self.assertFalse(run.skipped)
 
     run = page_run.PageRun(self.pages[0])
-    run.AddValue(scalar.ScalarValue(self.pages[0], 'a', 's', 1))
+    run.AddValue(scalar.ScalarValue(
+        self.pages[0], 'a', 's', 1,
+        improvement_direction=improvement_direction.DOWN))
     self.assertTrue(run.ok)
     self.assertFalse(run.failed)
     self.assertFalse(run.skipped)