[telemetry] Read MSRs from a separate privileged process.

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

Index: tools/telemetry/telemetry/core/platform/power_monitor/msr_power_monitor_unittest.py
diff --git a/tools/telemetry/telemetry/core/platform/power_monitor/msr_power_monitor_unittest.py b/tools/telemetry/telemetry/core/platform/power_monitor/msr_power_monitor_unittest.py
index 6a28509f4dca89fe360654046b1f72a9829dec54..f3408a759e2e6d767618425d1c42689defeaf09c 100644
--- a/tools/telemetry/telemetry/core/platform/power_monitor/msr_power_monitor_unittest.py
+++ b/tools/telemetry/telemetry/core/platform/power_monitor/msr_power_monitor_unittest.py
@@ -3,6 +3,7 @@
 # found in the LICENSE file.
 
 import logging
+import time
 import unittest
 
 from telemetry import decorators
@@ -12,12 +13,7 @@ from telemetry.core.platform.power_monitor import msr_power_monitor
 
 class MsrPowerMonitorTest(unittest.TestCase):
   @decorators.Enabled('win')
-  def testFindOrInstallWinRing0(self):
-    self.assertTrue(msr_power_monitor.WinRing0Path())
-
-  @decorators.Enabled('win')
-  def testMsrRunsWithoutErrors(self):
-    # Very basic test, doesn't validate any output data.
+  def testMsrRuns(self):
     platform_backend = win_platform_backend.WinPlatformBackend()
     power_monitor = msr_power_monitor.MsrPowerMonitor(platform_backend)
     if not power_monitor.CanMonitorPower():
@@ -25,7 +21,9 @@ class MsrPowerMonitorTest(unittest.TestCase):
       return
 
     power_monitor.StartMonitoringPower(None)
+    time.sleep(0.01)
     statistics = power_monitor.StopMonitoringPower()
 
     self.assertEqual(statistics['identifier'], 'msr')
     self.assertIn('energy_consumption_mwh', statistics)
+    self.assertGreater(statistics['energy_consumption_mwh'], 0)