Add getBatteryHistory method to query data from SettingsIntelligence

Bug: 184807417
Test: make SettingsRoboTests
Test: make SettingsGoogleRoboTests
Change-Id: Idd640f8f8b07311fafc76f7b61c96c453ae7b604

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

@@ -23,6 +23,9 @@ import android.util.SparseIntArray;
 import com.android.internal.os.BatterySipper;
 import com.android.settingslib.fuelgauge.Estimate;
 
+import java.util.List;
+import java.util.Map;
+
 /**
  * Feature Provider used in power usage
  */
@@ -126,7 +129,12 @@ public interface PowerUsageFeatureProvider {
     boolean isSmartBatterySupported();
 
     /**
-     * Checks whether we should enable chart graph design or not
+     * Checks whether we should enable chart graph design or not.
      */
     boolean isChartGraphEnabled(Context context);
+
+    /**
+     * Returns battery history data with corresponding timestamp key.
+     */
+    Map<Long, List<BatteryHistEntry>> getBatteryHistory(Context context);
 }