[Battery usage U] Create a flag to guard battery usage features

Bug: 261800937
Fix: 261800937
Test: manual
Change-Id: I891c235228c9ca0709471b496e6f75167fd0a126

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

@@ -29,6 +29,11 @@ import java.util.Set;
  */
 public interface PowerUsageFeatureProvider {
 
+    /**
+     * Check whether the battery usage button is enabled in the battery page
+     */
+    boolean isBatteryUsageEnabled(Context context);
+
     /**
      * Check whether location setting is enabled
      */