Add wakelock anomaly detector

This cl detects whether apps hold wakelock for long time.
For now we use the following attribute:
1. Longest total duration time among all the wakelocks
for one app.

Following cl will:
1. Get threshold from server side.
2. Add more attributes to make the detection more robust.

Bug: 36925184
Test: RunSettingsRoboTests

Change-Id: I1946faf69c363f6aa823d0005d6e03bc9082c085

src/com/android/settings/fuelgauge/anomaly/AnomalyLoader.java

@@ -39,13 +39,16 @@ public class AnomalyLoader extends AsyncLoader<List<Anomaly>> {
     }
 
     @Override
-    protected void onDiscardResult(List<Anomaly> result) {}
+    protected void onDiscardResult(List<Anomaly> result) {
+    }
 
     @Override
     public List<Anomaly> loadInBackground() {
         final List<Anomaly> anomalies = new ArrayList<>();
-        anomalies.addAll(new WakeLockAnomalyDetector().detectAnomalies(mBatteryStatsHelper));
+        anomalies.addAll(new WakeLockAnomalyDetector(getContext())
+                .detectAnomalies(mBatteryStatsHelper));
 
         return anomalies;
     }
+
 }