[telemetry] Add IPPET power monitor.

tools/telemetry/telemetry/core/platform/power_monitor/ippet_power_monitor_unittest.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 logging
+import unittest
+
+from telemetry import decorators
+from telemetry.core.platform import win_platform_backend
+from telemetry.core.platform.power_monitor import ippet_power_monitor
+
+
+class IppetPowerMonitorTest(unittest.TestCase):
+  @decorators.Enabled('win')
+  def testFindOrInstallIppet(self):
+    self.assertTrue(ippet_power_monitor.IppetPath())
+
+  @decorators.Enabled('win')
+  def testIppetRunsWithoutErrors(self):
+    # Very basic test, doesn't validate any output data.
+    platform_backend = win_platform_backend.WinPlatformBackend()
+    power_monitor = ippet_power_monitor.IppetPowerMonitor(platform_backend)
+    if not power_monitor.CanMonitorPower():
+      logging.warning('Test not supported on this platform.')
+      return
+
+    power_monitor.StartMonitoringPower(None)
+    statistics = power_monitor.StopMonitoringPower()
+
+    self.assertEqual(statistics['identifier'], 'ippet')