[Telemetry] CPU stats are added to results and always reported on CrOS.

tools/perf/metrics/power.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import time
 
 from metrics import Metric
 from telemetry.value import scalar
 
 
@@ skipping 120 matching lines @@
           important=False))
 
     # Add temperature measurements.
     whole_package_utilization = component_utilization.get('whole_package', {})
     board_temperature_c = whole_package_utilization.get('average_temperature_c')
     if board_temperature_c is not None:
       results.AddValue(scalar.ScalarValue(
           results.current_page, 'board_temperature', 'celsius',
           board_temperature_c, important=False))
 
+    # Add CPU frequency measurements.
+    frequency_hz = whole_package_utilization.get('frequency_percent')
+    if frequency_hz is not None:
+      frequency_sum = 0.0
+      for freq, percent in frequency_hz.iteritems():
+        frequency_sum += freq * (percent / 100.0)
+      results.AddValue(scalar.ScalarValue(
+          results.current_page, 'cpu_average_frequency_hz', 'Hz',
+          frequency_sum, important=False))
+
+    # Add CPU c-state residency measurements.
+    cstate_percent = whole_package_utilization.get('cstate_residency_percent')
+    if cstate_percent is not None:
+      for state, percent in cstate_percent.iteritems():
+        results.AddValue(scalar.ScalarValue(
+            results.current_page, 'cpu_cstate_%s_residency_percent' % state,
+            '%', percent, important=False))
+
     self._results = None
 
 def _SubtractCpuStats(cpu_stats, start_cpu_stats):
   """Computes number of idle wakeups that occurred over measurement period.
 
   Each of the two cpu_stats arguments is a dict as returned by the
   Browser.cpu_stats call.
 
   Returns:
     A dict of process type names (Browser, Renderer, etc.) to idle wakeup count
     over the period recorded by the input.
   """
   cpu_delta = {}
   for process_type in cpu_stats:
     assert process_type in start_cpu_stats, 'Mismatching process types'
     # Skip any process_types that are empty.
     if (not cpu_stats[process_type]) or (not start_cpu_stats[process_type]):
       continue
     # Skip if IdleWakeupCount is not present.
     if (('IdleWakeupCount' not in cpu_stats[process_type]) or
         ('IdleWakeupCount' not in start_cpu_stats[process_type])):
       continue
     idle_wakeup_delta = (cpu_stats[process_type]['IdleWakeupCount'] -
                         start_cpu_stats[process_type]['IdleWakeupCount'])
     cpu_delta[process_type] = idle_wakeup_delta
   return cpu_delta