Defined help page for Data Saver.

BUG: 28865521
Change-Id: I07930232312df2775ecee5beacee6921f7245847

src/com/android/settings/datausage/DataSaverSummary.java

@@ -18,6 +18,7 @@ import android.app.Application;
 import android.os.Bundle;
 import android.support.v7.preference.Preference;
 import android.widget.Switch;
+
 import com.android.internal.logging.MetricsProto.MetricsEvent;
 import com.android.settings.R;
 import com.android.settings.SettingsActivity;
@@ -94,6 +95,11 @@ public class DataSaverSummary extends SettingsPreferenceFragment
         return MetricsEvent.DATA_SAVER_SUMMARY;
     }
 
+    @Override
+    protected int getHelpResource() {
+        return R.string.help_url_data_saver;
+    }
+
     @Override
     public void onDataSaverChanged(boolean isDataSaving) {
         mSwitchBar.setChecked(isDataSaving);