Framework for the anomaly detection.

This cl adds the following components for anomaly dection:
1. AnomalyLoader: run all the anomaly checks in the background
2. Anomaly: Data class to represent what anomaly it is
3. Detector: Different kinds of anomaly detector with common interface
4. Action:  Suggestions when facing anomaly(Force stop, uninstall)
5. AnomalyDialogFragment: show the confirm dialog for action
6. AnomalyPreferenceController: handle update and click for
anomalyPreference, since it will be used in multiple fragments.
7. AnomalyUtils: utility class for anomaly

This cl also adds skeleton for the wakelock check and action. Following
cls will add real implementation about it.

Bug: 36924669
Test: RunSettingsRoboTests
Change-Id: I89fc4b6963757869b93791b4275ca53c04ab9604

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

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.fuelgauge.anomaly;
+
+import android.content.Context;
+
+import com.android.internal.os.BatteryStatsHelper;
+import com.android.settings.fuelgauge.anomaly.checker.WakeLockAnomalyDetector;
+import com.android.settings.utils.AsyncLoader;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Loader to compute which apps are anomaly and return a anomaly list. It will return
+ * an empty list if there is no anomaly.
+ */
+//TODO(b/36924669): add test for this file, for now it seems there is nothing to test
+public class AnomalyLoader extends AsyncLoader<List<Anomaly>> {
+    private BatteryStatsHelper mBatteryStatsHelper;
+
+    public AnomalyLoader(Context context, BatteryStatsHelper batteryStatsHelper) {
+        super(context);
+        mBatteryStatsHelper = batteryStatsHelper;
+    }
+
+    @Override
+    protected void onDiscardResult(List<Anomaly> result) {}
+
+    @Override
+    public List<Anomaly> loadInBackground() {
+        final List<Anomaly> anomalies = new ArrayList<>();
+        anomalies.addAll(new WakeLockAnomalyDetector().detectAnomalies(mBatteryStatsHelper));
+
+        return anomalies;
+    }
+}