Update browsermark to use results.AddValue(..)

tools/perf/benchmarks/browsermark.py

Index: tools/perf/benchmarks/browsermark.py
diff --git a/tools/perf/benchmarks/browsermark.py b/tools/perf/benchmarks/browsermark.py
index 5ab389fcac00baf753766df905dc8a76ef8c9d2c..a1ff261f100c261ede65f310af1bbd41dc4f1c49 100644
--- a/tools/perf/benchmarks/browsermark.py
+++ b/tools/perf/benchmarks/browsermark.py
@@ -23,6 +23,7 @@ import os
 from telemetry import benchmark
 from telemetry.page import page_measurement
 from telemetry.page import page_set
+from telemetry.value import scalar
 
 class _BrowsermarkMeasurement(page_measurement.PageMeasurement):
 
@@ -41,7 +42,8 @@ class _BrowsermarkMeasurement(page_measurement.PageMeasurement):
       'window.location.pathname.indexOf("results") != -1', 600)
     result = int(tab.EvaluateJavaScript(
         'document.getElementsByClassName("score")[0].innerHTML'))
-    results.Add('Score', 'score', result)
+    results.AddValue(
+        scalar.ScalarValue(results.current_page, 'Score', 'score', result))
 
 
 @benchmark.Disabled