Update pica to use results.AddValue(...)

BUG=391943
TBR=nduca@chromium.org

Review URL: https://codereview.chromium.org/373033005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@281916 0039d316-1c4b-4281-b951-d872f2087c98

tools/perf/benchmarks/pica.py

@@ -5,6 +5,7 @@
 import page_sets
 from telemetry import benchmark
 from telemetry.page import page_measurement
+from telemetry.value import scalar
 
 class _PicaMeasurement(page_measurement.PageMeasurement):
   def CustomizeBrowserOptions(self, options):
@@ -14,7 +15,8 @@ class _PicaMeasurement(page_measurement.PageMeasurement):
 
   def MeasurePage(self, _, tab, results):
     result = int(tab.EvaluateJavaScript('__polymer_ready_time'))
-    results.Add('Total', 'ms', result)
+    results.AddValue(scalar.ScalarValue(
+        results.current_page, 'Total', 'ms', result))
 
 
 class Pica(benchmark.Benchmark):