Telemetry: Implement idle wakeups counting on Android.

tools/perf/metrics/power.py

Index: tools/perf/metrics/power.py
diff --git a/tools/perf/metrics/power.py b/tools/perf/metrics/power.py
index 0f33d2d41b19d751ae52f70c413578fe4e1c4798..e9df8f88a5b4cd938c7d5a95dbe4ef06f489b47c 100644
--- a/tools/perf/metrics/power.py
+++ b/tools/perf/metrics/power.py
@@ -69,6 +69,9 @@ class PowerMetric(Metric):
   def Start(self, _, tab):
     self._browser = tab.browser
 
+    if self._platform.CanMeasureIdleWakeUps():
+      self._platform.StartMeasuringIdleWakeUps()
+
     if not self._platform.CanMonitorPower():
       return
 
@@ -81,6 +84,9 @@ class PowerMetric(Metric):
     self._running = True
 
   def Stop(self, _, tab):
+    if self._platform.CanMeasureIdleWakeUps():
+      self._platform.StopMeasuringIdleWakeUps()
+
     if not self._platform.CanMonitorPower():
       return