Add wakeup alarm anomaly detector

Wakeup alarm count frequent is calculated by a / b, where
1. a: the total wakeup alarm count since the last full charge
2. b: total time running since last full charge
(include sleeping time)

This cl also has the following changes:
1. Move bunch of methods to BatteryUtils
2. Create type WAKEUP_ALARM
3. Add and update tests

Upcoming cl will make sure we get the threshold from
AnomalyDetectionPolicy

Bug: 36921529
Test: RunSettingsRoboTests
Change-Id: I4f7b85606df68b6057f6c7d3f3be7f9a9a747f1d

src/com/android/settings/fuelgauge/PowerUsageSummary.java

@@ -499,7 +499,8 @@ public class PowerUsageSummary extends PowerUsageBase implements
         BatteryInfo batteryInfo = getBatteryInfo(elapsedRealtimeUs, batteryBroadcast);
         updateHeaderPreference(batteryInfo);
 
-        final long runningTime = calculateRunningTimeBasedOnStatsType();
+        final long runningTime = mBatteryUtils.calculateRunningTimeBasedOnStatsType(mStatsHelper,
+                mStatsType);
         updateScreenPreference();
         updateLastFullChargePreference(runningTime);
 
@@ -655,14 +656,6 @@ public class PowerUsageSummary extends PowerUsageBase implements
                         timeSequence));
     }
 
-    @VisibleForTesting
-    long calculateRunningTimeBasedOnStatsType() {
-        final long elapsedRealtimeUs = mBatteryUtils.convertMsToUs(SystemClock.elapsedRealtime());
-        // Return the battery time (millisecond) on status mStatsType
-        return mStatsHelper.getStats().computeBatteryRealtime(elapsedRealtimeUs,
-                mStatsType /* STATS_SINCE_CHARGED */) / 1000;
-    }
-
     @VisibleForTesting
     void updateHeaderPreference(BatteryInfo info) {
         final Context context = getContext();