Adding dumpsys based power monitor for android.

tools/telemetry/telemetry/core/platform/android_platform_backend.py

Index: tools/telemetry/telemetry/core/platform/android_platform_backend.py
diff --git a/tools/telemetry/telemetry/core/platform/android_platform_backend.py b/tools/telemetry/telemetry/core/platform/android_platform_backend.py
index ff1f70d729705307303243ab922b2bede66b8968..171002106ba1fe980255c0abcd33647979e63822 100644
--- a/tools/telemetry/telemetry/core/platform/android_platform_backend.py
+++ b/tools/telemetry/telemetry/core/platform/android_platform_backend.py
@@ -14,6 +14,7 @@ from telemetry.core import util
 from telemetry.core.platform import proc_supporting_platform_backend
 from telemetry.core.platform import factory
 from telemetry.core.platform.power_monitor import android_ds2784_power_monitor
+from telemetry.core.platform.power_monitor import android_dumpsys_power_monitor
 from telemetry.core.platform.power_monitor import monsoon_power_monitor
 from telemetry.core.platform.power_monitor import power_monitor_controller
 from telemetry.core.platform.profiler import android_prebuilt_profiler_helper
@@ -52,7 +53,8 @@ class AndroidPlatformBackend(
         self._adb.CanAccessProtectedFileContents()
     self._powermonitor = power_monitor_controller.PowerMonitorController([
         monsoon_power_monitor.MonsoonPowerMonitor(),
-        android_ds2784_power_monitor.DS2784PowerMonitor(adb)
+        android_ds2784_power_monitor.DS2784PowerMonitor(adb),
+        android_dumpsys_power_monitor.DumpsysPowerMonitor(adb),
     ])
     self._video_recorder = None
     self._video_output = None
@@ -250,14 +252,14 @@ class AndroidPlatformBackend(
     for frame in self._FramesFromMp4(self._video_output):
       yield frame
 
-  def CanMonitorPowerAsync(self):
-    return self._powermonitor.CanMonitorPowerAsync()
+  def CanMonitorPower(self):
+    return self._powermonitor.CanMonitorPower()
 
-  def StartMonitoringPowerAsync(self):
-    self._powermonitor.StartMonitoringPowerAsync()
+  def StartMonitoringPower(self, browser):
+    self._powermonitor.StartMonitoringPower(browser)
 
-  def StopMonitoringPowerAsync(self):
-    return self._powermonitor.StopMonitoringPowerAsync()
+  def StopMonitoringPower(self):
+    return self._powermonitor.StopMonitoringPower()
 
   def _FramesFromMp4(self, mp4_file):
     if not self.CanLaunchApplication('avconv'):