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

tools/perf/benchmarks/octane.py

Index: tools/perf/benchmarks/octane.py
diff --git a/tools/perf/benchmarks/octane.py b/tools/perf/benchmarks/octane.py
index 4fdecaea8475beec35781b9db3d911ee22001a52..a7863f98fe67adbf179225b0e1b6278dea7e1911 100644
--- a/tools/perf/benchmarks/octane.py
+++ b/tools/perf/benchmarks/octane.py
@@ -19,6 +19,7 @@ from telemetry import page as page_module
 from telemetry.page import page_set
 from telemetry.page import page_test
 from telemetry.util import statistics
+from telemetry.value import improvement_direction
 from telemetry.value import scalar
 
 _GB = 1024 * 1024 * 1024
@@ -118,7 +119,8 @@ class _OctaneMeasurement(page_test.PageTest):
         score = int(score_and_name[1])
         results.AddValue(scalar.ScalarValue(
             results.current_page, name, 'score', score, important=False,
-            description=DESCRIPTIONS.get(name)))
+            description=DESCRIPTIONS.get(name),
+            improvement_direction=improvement_direction.UP))
 
         # Collect all test scores to compute geometric mean.
         all_scores.append(score)
@@ -127,7 +129,8 @@ class _OctaneMeasurement(page_test.PageTest):
         scalar.ScalarValue(None, 'Total.Score', 'score', total,
                            description='Geometric mean of the scores of each '
                                        'individual benchmark in the Octane '
-                                       'benchmark collection.'))
+                                       'benchmark collection.',
+                           improvement_direction=improvement_direction.UP))
 
 
 class Octane(benchmark.Benchmark):