Added frequency stats and c-state residency to CrOS power monitor.

tools/telemetry/telemetry/core/platform/power_monitor/cros_sysfs_platform_unittest.py

Index: tools/telemetry/telemetry/core/platform/power_monitor/cros_sysfs_platform_unittest.py
diff --git a/tools/telemetry/telemetry/core/platform/power_monitor/cros_sysfs_platform_unittest.py b/tools/telemetry/telemetry/core/platform/power_monitor/cros_sysfs_platform_unittest.py
new file mode 100644
index 0000000000000000000000000000000000000000..4504848a01a076d97eddbebc15ef6b8510ec04c9
--- /dev/null
+++ b/tools/telemetry/telemetry/core/platform/power_monitor/cros_sysfs_platform_unittest.py
@@ -0,0 +1,39 @@
+# 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 unittest
+
+from telemetry.core.platform.power_monitor import cros_sysfs_platform
+
+
+class CrosSysfsPlatformTest(unittest.TestCase):
+  start_time = 1403211341
+  initial_cstate = {
+    'cpu0': 'POLL\nC1\nC2\nC3\n0\n138356189\n102416540\n'
+            '17158209182\n0\n1\n500\n1000',
+    'cpu1': 'POLL\nC1\nC2\nC3\n0\n107318149\n81786238\n'
+            '17348563431\n0\n1\n500\n1000'
+  }
+  expected_cstate = {
+    'cpu0': {
+      'C0': 1403193942018089,
+      'C1': 138356189,
+      'C2': 102416540,
+      'C3': 17158209182
+    },
+    'cpu1': {
+      'C0': 1403193803332182,
+      'C1': 107318149,
+      'C2': 81786238,
+      'C3': 17348563431
+    }
+  }
+  def testCrosParseCpuStates(self):
+    # Use mock start and end times to allow for the test to calculate C0.
+    results = cros_sysfs_platform.CrosSysfsPlatform.ParseStateSample(
+        self.initial_cstate, self.start_time)
+    for cpu in results:
+      for state in results[cpu]:
+        self.assertAlmostEqual(results[cpu][state],
+                               self.expected_cstate[cpu][state])