Add extra log for battery tip.

For each visible battery tip, logs its type and state. For battery tip
with app list, also log that list:

1. HighUsageTip: apps that used too much battery
2. RestrictAppTip: apps with anomaly, also logs the anomaly type

Bug: 73888115
Test: RunSettingsRoboTests
Change-Id: I1b61eb1d793d979baab4864d2d652e12260b590d

src/com/android/settings/fuelgauge/batterytip/tips/BatteryTip.java

@@ -25,6 +25,8 @@ import android.support.annotation.VisibleForTesting;
 import android.support.v7.preference.Preference;
 import android.util.SparseIntArray;
 
+import com.android.settingslib.core.instrumentation.MetricsFeatureProvider;
+
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 
@@ -123,6 +125,11 @@ public abstract class BatteryTip implements Comparable<BatteryTip>, Parcelable {
      */
     public abstract void updateState(BatteryTip tip);
 
+    /**
+     * Log the battery tip
+     */
+    public abstract void log(Context context, MetricsFeatureProvider metricsFeatureProvider);
+
     public Preference buildPreference(Context context) {
         Preference preference = new Preference(context);