Add key_idle_power_cases for ensuring idle activity on Android

tools/perf/measurements/thread_times.py

Index: tools/perf/measurements/thread_times.py
diff --git a/tools/perf/measurements/thread_times.py b/tools/perf/measurements/thread_times.py
index 70c1f0912fb1ad35d4bcad747712d646f862538c..12cd4cdfedebd887c0480486ae4abfbf525f0b73 100644
--- a/tools/perf/measurements/thread_times.py
+++ b/tools/perf/measurements/thread_times.py
@@ -11,10 +11,11 @@ from metrics import timeline
 
 
 class ThreadTimes(page_test.PageTest):
-  def __init__(self, report_silk_details=False):
+  def __init__(self, report_silk_details=False, measure_per_frame=True):
     super(ThreadTimes, self).__init__()
     self._timeline_controller = None
     self._report_silk_details = report_silk_details
+    self._measure_per_frame = measure_per_frame
 
   def WillNavigateToPage(self, page, tab):
     self._timeline_controller = timeline_controller.TimelineController()
@@ -31,7 +32,7 @@ class ThreadTimes(page_test.PageTest):
 
   def ValidateAndMeasurePage(self, page, tab, results):
     self._timeline_controller.Stop(tab, results)
-    metric = timeline.ThreadTimesTimelineMetric()
+    metric = timeline.ThreadTimesTimelineMetric(self._measure_per_frame)
     renderer_thread = \
         self._timeline_controller.model.GetRendererThreadFromTabId(tab.id)
     if self._report_silk_details: