Implements the buttons layout for the extra defend

Bug: 235246949
Test: make RunSettingsRoboTests ROBOTEST_FILTER=com.android.settings.fuelgauge.*
Test: make RunSettingsRoboTests ROBOTEST_FILTER=com.android.settings.widget.CardPreferenceTest
Test: manual test
Change-Id: I1dc4ab31adf85c684a4c09bd6c9bcfb54b52dc3c

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

@@ -139,6 +139,11 @@ public interface PowerUsageFeatureProvider {
      */
     boolean isAdaptiveChargingSupported();
 
+    /**
+     * Returns {@code true} if current defender mode is extra defend
+     */
+    boolean isExtraDefend();
+
     /**
      * Gets a intent for one time bypass charge limited to resume charging.
      */