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

tools/telemetry/telemetry/value/scalar_unittest.py

Index: tools/telemetry/telemetry/value/scalar_unittest.py
diff --git a/tools/telemetry/telemetry/value/scalar_unittest.py b/tools/telemetry/telemetry/value/scalar_unittest.py
index 14abd21818e742020bdae11b7b2ce3a98d72ae57..24ad641620a01f75419dc717e38bf164353b786d 100644
--- a/tools/telemetry/telemetry/value/scalar_unittest.py
+++ b/tools/telemetry/telemetry/value/scalar_unittest.py
@@ -40,8 +40,8 @@ class ValueTest(TestBase):
 
   def testScalarSamePageMerging(self):
     page0 = self.pages[0]
-    v0 = scalar.ScalarValue(page0, 'x', 'unit', 1)
-    v1 = scalar.ScalarValue(page0, 'x', 'unit', 2)
+    v0 = scalar.ScalarValue(page0, 'x', 'unit', 1, higher_is_better=True)
+    v1 = scalar.ScalarValue(page0, 'x', 'unit', 2, higher_is_better=True)
     self.assertTrue(v1.IsMergableWith(v0))
 
     vM = scalar.ScalarValue.MergeLikeValuesFromSamePage([v0, v1])
@@ -50,6 +50,7 @@ class ValueTest(TestBase):
     self.assertEquals('unit', vM.units)
     self.assertEquals(True, vM.important)
     self.assertEquals([1, 2], vM.values)
+    self.assertEquals(True, vM.higher_is_better)
 
   def testScalarDifferentPageMerging(self):
     page0 = self.pages[0]
@@ -63,6 +64,7 @@ class ValueTest(TestBase):
     self.assertEquals('unit', vM.units)
     self.assertEquals(True, vM.important)
     self.assertEquals([1, 2], vM.values)
+    self.assertEquals(None, vM.higher_is_better)
 
   def testScalarWithNoneValueMerging(self):
     page0 = self.pages[0]
@@ -109,13 +111,15 @@ class ValueTest(TestBase):
       'type': 'scalar',
       'name': 'x',
       'units': 'unit',
-      'value': 42
+      'value': 42,
+      'higher_is_better': False
     }
 
     v = value.Value.FromDict(d, {})
 
     self.assertTrue(isinstance(v, scalar.ScalarValue))
     self.assertEquals(v.value, 42)
+    self.assertEquals(False, v.higher_is_better)
 
   def testFromDictFloat(self):
     d = {