Add dump log for BatteryTip.

Since BatteryTipLoader will dump all BatteryTips, so we only need
to add toString() for it.

Bug: 74246970
Test: RunSettingsRoboTests
Change-Id: I0a89c4ac06d107274d47f8b4b66867373c062c1b

src/com/android/settings/fuelgauge/batterytip/tips/RestrictAppTip.java

@@ -97,6 +97,19 @@ public class RestrictAppTip extends BatteryTip {
         return mRestrictAppList;
     }
 
+    @Override
+    public String toString() {
+        final StringBuilder stringBuilder = new StringBuilder(super.toString());
+        stringBuilder.append(" {");
+        for (int i = 0, size = mRestrictAppList.size(); i < size; i++) {
+            final AppInfo appInfo = mRestrictAppList.get(i);
+            stringBuilder.append(" " + appInfo.toString() + " ");
+        }
+        stringBuilder.append('}');
+
+        return stringBuilder.toString();
+    }
+
     @Override
     public void writeToParcel(Parcel dest, int flags) {
         super.writeToParcel(dest, flags);