Reland of [Android][Telemetry] Add support for multiple power monitors

tools/telemetry/telemetry/internal/platform/power_monitor/monsoon_power_monitor.py

Index: tools/telemetry/telemetry/internal/platform/power_monitor/monsoon_power_monitor.py
diff --git a/tools/telemetry/telemetry/internal/platform/power_monitor/monsoon_power_monitor.py b/tools/telemetry/telemetry/internal/platform/power_monitor/monsoon_power_monitor.py
index 2524531bd197fa910822d825b43c44afad839c4e..a9537e0fc4ddedd9b18c91c30727081a60b16e9d 100644
--- a/tools/telemetry/telemetry/internal/platform/power_monitor/monsoon_power_monitor.py
+++ b/tools/telemetry/telemetry/internal/platform/power_monitor/monsoon_power_monitor.py
@@ -8,7 +8,7 @@
 import time
 
 from telemetry.core import exceptions
-from telemetry.internal.platform.power_monitor import sysfs_power_monitor
+from telemetry.internal.platform import power_monitor
 from telemetry.internal.platform.profiler import monsoon
 
 
@@ -42,13 +42,14 @@
     }
     json.dump(result, output)
 
-class MonsoonPowerMonitor(sysfs_power_monitor.SysfsPowerMonitor):
+class MonsoonPowerMonitor(power_monitor.PowerMonitor):
   def __init__(self, _, platform_backend):
-    super(MonsoonPowerMonitor, self).__init__(platform_backend)
+    super(MonsoonPowerMonitor, self).__init__()
     self._powermonitor_process = None
     self._powermonitor_output_file = None
     self._is_collecting = None
     self._monsoon = None
+    self._platform = platform_backend
     try:
       self._monsoon = monsoon.Monsoon(wait=False)
       # Nominal Li-ion voltage is 3.7V, but it puts out 4.2V at max capacity.
@@ -65,7 +66,6 @@
   def StartMonitoringPower(self, browser):
     assert not self._powermonitor_process, (
         'Must call StopMonitoringPower().')
-    super(MonsoonPowerMonitor, self).StartMonitoringPower(browser)
     self._powermonitor_output_file = tempfile.TemporaryFile()
     self._is_collecting = multiprocessing.Event()
     self._powermonitor_process = multiprocessing.Process(
@@ -84,7 +84,6 @@
     assert self._powermonitor_process, (
         'StartMonitoringPower() not called.')
     try:
-      cpu_stats = super(MonsoonPowerMonitor, self).StopMonitoringPower()
       # Tell powermonitor to take an immediate sample and join.
       self._is_collecting.clear()
       self._powermonitor_process.join()
@@ -92,9 +91,7 @@
         self._powermonitor_output_file.seek(0)
         powermonitor_output = self._powermonitor_output_file.read()
       assert powermonitor_output, 'PowerMonitor produced no output'
-      power_stats = MonsoonPowerMonitor.ParseSamplingOutput(powermonitor_output)
-      return super(MonsoonPowerMonitor, self).CombineResults(cpu_stats,
-                                                             power_stats)
+      return MonsoonPowerMonitor.ParseSamplingOutput(powermonitor_output)
     finally:
       self._powermonitor_output_file = None
       self._powermonitor_process = None
@@ -121,6 +118,6 @@
     out_dict = {}
     out_dict['identifier'] = 'monsoon'
     out_dict['power_samples_mw'] = power_samples
-    out_dict['energy_consumption_mwh'] = total_energy_consumption_mwh
+    out_dict['monsoon_energy_consumption_mwh'] = total_energy_consumption_mwh
 
     return out_dict