Telemetry: Implement idle wakeups counting on Android.

tools/telemetry/telemetry/core/platform/mac_platform_backend.py

Index: tools/telemetry/telemetry/core/platform/mac_platform_backend.py
diff --git a/tools/telemetry/telemetry/core/platform/mac_platform_backend.py b/tools/telemetry/telemetry/core/platform/mac_platform_backend.py
index 002d5212de3cafccac3b027770cc8a9b2d1d2922..017828ed74f1892ad03ec25253aaab3d5ed8237e 100644
--- a/tools/telemetry/telemetry/core/platform/mac_platform_backend.py
+++ b/tools/telemetry/telemetry/core/platform/mac_platform_backend.py
@@ -93,8 +93,7 @@ class MacPlatformBackend(posix_platform_backend.PosixPlatformBackend):
     results = {'CpuProcessTime': cpu_time,
                'ContextSwitches': proc_info.pti_csw}
 
-    # top only reports idle wakeup count starting from OS X 10.9.
-    if self.GetOSVersionName() >= platform_backend.MAVERICKS:
+    if self.CanMeasureIdleWakeUps():
       results.update({'IdleWakeupCount': self._GetIdleWakeupCount(pid)})
     return results
 
@@ -165,6 +164,10 @@ class MacPlatformBackend(posix_platform_backend.PosixPlatformBackend):
   def CanMonitorPower(self):
     return self._power_monitor.CanMonitorPower()
 
+  def CanMeasureIdleWakeUps(self):
+    # top only reports idle wakeup count starting from OS X 10.9.
+    return self.GetOSVersionName() >= platform_backend.MAVERICKS
+
   def CanMeasurePerApplicationPower(self):
     return self._power_monitor.CanMeasurePerApplicationPower()
 
@@ -173,3 +176,11 @@ class MacPlatformBackend(posix_platform_backend.PosixPlatformBackend):
 
   def StopMonitoringPower(self):
     return self._power_monitor.StopMonitoringPower()
+
+  def StartMeasuringIdleWakeUps(self):
+    """Do nothing. The idle wake up numbers come from top."""
+    pass
+
+  def StopMeasuringIdleWakeUps(self):
+    """Do nothing. The idle wake up numbers come from top."""
+    pass