Telemetry: adds CPU frequency stats.

tools/perf/measurements/page_cycler.py

Index: tools/perf/measurements/page_cycler.py
diff --git a/tools/perf/measurements/page_cycler.py b/tools/perf/measurements/page_cycler.py
index b7dffbc461c223fda18aeae8f1b6eb032e1a1c3b..e7803a41844d985872dfb74f5525e09f3dd3b53b 100644
--- a/tools/perf/measurements/page_cycler.py
+++ b/tools/perf/measurements/page_cycler.py
@@ -81,15 +81,11 @@ class PageCycler(page_measurement.PageMeasurement):
       tab.ClearCache(force=True)
     if self._report_speed_index:
       self._speedindex_metric.Start(page, tab)
+    self._cpu_metric.Start(page, tab)
 
   def DidNavigateToPage(self, page, tab):
     self._memory_metric.Start(page, tab)
     self._power_metric.Start(page, tab)
-    # TODO(qyearsley): Uncomment the following line and move it to
-    # WillNavigateToPage once the cpu metric has been changed.
-    # This is being temporarily commented out to let the page cycler
-    # results return to how they were before the cpu metric was added.
-    # self._cpu_metric.Start(page, tab) See crbug.com/301714.
     if self._record_v8_object_stats:
       self._v8_object_stats_metric.Start(page, tab)
 
@@ -144,8 +140,8 @@ class PageCycler(page_measurement.PageMeasurement):
 
     # TODO(qyearsley): Uncomment the following line when CPU metric is
     # changed. See crbug.com/301714.
-    # self._cpu_metric.Stop(page, tab)
-    # self._cpu_metric.AddResults(tab, results)
+    self._cpu_metric.Stop(page, tab)
+    self._cpu_metric.AddResults(tab, results)
     if self._record_v8_object_stats:
       self._v8_object_stats_metric.Stop(page, tab)
       self._v8_object_stats_metric.AddResults(tab, results)