Hide Camera background running time in the battery usage screen

hide camera background running time in the battery usage screen to avoid
users confuse about it, since it will standby in the backgound to sspeed
up launching time, not always running in the background

Bug: 196744910
Test: make SettingsRoboTests
Change-Id: Ia391d661bca44435fc5a68b1c86e5ca32dd0fcfe

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

@@ -24,6 +24,7 @@ import android.util.SparseIntArray;
 import com.android.internal.os.BatterySipper;
 import com.android.settingslib.fuelgauge.Estimate;
 
+import java.util.List;
 import java.util.Map;
 
 /**
@@ -147,4 +148,9 @@ public interface PowerUsageFeatureProvider {
      * Returns {@link Uri} to monitor battery history data is update.
      */
     Uri getBatteryHistoryUri();
+
+    /**
+     * Returns {@link List} for hidding applications background usage time.
+     */
+    List<CharSequence> getHideBackgroundUsageTimeList(Context context);
 }