[Android] Support idle wakeup measurement with /proc/timer_stats

tools/telemetry/telemetry/internal/platform/mac_platform_backend.py

Index: tools/telemetry/telemetry/internal/platform/mac_platform_backend.py
diff --git a/tools/telemetry/telemetry/internal/platform/mac_platform_backend.py b/tools/telemetry/telemetry/internal/platform/mac_platform_backend.py
index 342e5c66c80e850c6c4e10c1abfb1d19cd35b714..a23864fffeb2e082f7cb23bf8f0dc1dddaab0a72 100644
--- a/tools/telemetry/telemetry/internal/platform/mac_platform_backend.py
+++ b/tools/telemetry/telemetry/internal/platform/mac_platform_backend.py
@@ -89,8 +89,7 @@ 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() >= os_version_module.MAVERICKS:
+    if self.CanMeasureIdleWakeUps():
       results.update({'IdleWakeupCount': self._GetIdleWakeupCount(pid)})
     return results
 
@@ -161,6 +160,10 @@ 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() >= os_version_module.MAVERICKS
+
   def CanMeasurePerApplicationPower(self):
     return self._power_monitor.CanMeasurePerApplicationPower()
 
@@ -169,3 +172,11 @@ 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