[Telemetry] Introduce SummarizableValue.

tools/telemetry/telemetry/internal/results/json_output_formatter_unittest.py

Index: tools/telemetry/telemetry/internal/results/json_output_formatter_unittest.py
diff --git a/tools/telemetry/telemetry/internal/results/json_output_formatter_unittest.py b/tools/telemetry/telemetry/internal/results/json_output_formatter_unittest.py
index ae981388222971aa8b4730244fb48b1db6e3bc42..46cdd5861b40bf2dad94b5fee95cce4a0b682784 100644
--- a/tools/telemetry/telemetry/internal/results/json_output_formatter_unittest.py
+++ b/tools/telemetry/telemetry/internal/results/json_output_formatter_unittest.py
@@ -14,6 +14,7 @@ from telemetry.internal.results import json_output_formatter
 from telemetry.internal.results import page_test_results
 from telemetry import page as page_module
 from telemetry.timeline import trace_data
+from telemetry.value import improvement_direction
 from telemetry.value import scalar
 from telemetry.value import trace
 
@@ -46,7 +47,8 @@ class JsonOutputFormatterTest(unittest.TestCase):
     self._output.truncate(0)
 
     results.WillRunPage(self._story_set[0])
-    v0 = scalar.ScalarValue(results.current_page, 'foo', 'seconds', 3)
+    v0 = scalar.ScalarValue(results.current_page, 'foo', 'seconds', 3,
+                            improvement_direction=improvement_direction.DOWN)
     results.AddValue(v0)
     results.DidRunPage(self._story_set[0])
 
@@ -65,7 +67,8 @@ class JsonOutputFormatterTest(unittest.TestCase):
   def testAsDictWithOnePage(self):
     results = page_test_results.PageTestResults()
     results.WillRunPage(self._story_set[0])
-    v0 = scalar.ScalarValue(results.current_page, 'foo', 'seconds', 3)
+    v0 = scalar.ScalarValue(results.current_page, 'foo', 'seconds', 3,
+                            improvement_direction=improvement_direction.DOWN)
     results.AddValue(v0)
     results.DidRunPage(self._story_set[0])
 
@@ -103,12 +106,14 @@ class JsonOutputFormatterTest(unittest.TestCase):
   def testAsDictWithTwoPages(self):
     results = page_test_results.PageTestResults()
     results.WillRunPage(self._story_set[0])
-    v0 = scalar.ScalarValue(results.current_page, 'foo', 'seconds', 3)
+    v0 = scalar.ScalarValue(results.current_page, 'foo', 'seconds', 3,
+                            improvement_direction=improvement_direction.DOWN)
     results.AddValue(v0)
     results.DidRunPage(self._story_set[0])
 
     results.WillRunPage(self._story_set[1])
-    v1 = scalar.ScalarValue(results.current_page, 'bar', 'seconds', 4)
+    v1 = scalar.ScalarValue(results.current_page, 'bar', 'seconds', 4,
+                            improvement_direction=improvement_direction.DOWN)
     results.AddValue(v1)
     results.DidRunPage(self._story_set[1])
 
@@ -122,7 +127,8 @@ class JsonOutputFormatterTest(unittest.TestCase):
 
   def testAsDictWithSummaryValueOnly(self):
     results = page_test_results.PageTestResults()
-    v = scalar.ScalarValue(None, 'baz', 'seconds', 5)
+    v = scalar.ScalarValue(None, 'baz', 'seconds', 5,
+                           improvement_direction=improvement_direction.DOWN)
     results.AddSummaryValue(v)
 
     d = json_output_formatter.ResultsAsDict(results,