Update battery summary

When it is charging, show "5% - charging"(not only "5%")

Bug: 112013485
Test: RunSettingsRoboTests
Change-Id: If2299cc4929d8fc40d63669b74590fafe39122dc

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

@@ -80,7 +80,9 @@ public class TopLevelBatteryPreferenceController extends BasePreferenceControlle
         }
         CharSequence label;
         final BidiFormatter formatter = BidiFormatter.getInstance();
-        if (info.remainingLabel == null) {
+        if (!info.discharging && info.chargeLabel != null) {
+            label = info.chargeLabel;
+        } else if (info.remainingLabel == null) {
             label = info.batteryPercentString;
         } else {
             label = context.getString(R.string.power_remaining_settings_home_page,