enable modifiers for native apps

chrome/android/javatests/src/org/chromium/chrome/browser/payments/PaymentRequestTestRule.java

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.payments;
 
 import android.view.View;
 
 import org.junit.runner.Description;
 import org.junit.runners.model.Statement;
@@ skipping 214 matching lines @@
     /** Gets the button state for the contact details section. */
     protected int getContactDetailsButtonState() throws ExecutionException {
         return mTestCommon.getContactDetailsButtonState();
     }
 
     /**  Returns the label corresponding to the payment instrument at the specified |index|. */
     protected String getPaymentInstrumentLabel(final int index) throws ExecutionException {
         return mTestCommon.getPaymentInstrumentLabel(index);
     }
 
+    /** Returns the label of the selected payment instrument. */
+    protected String getSelectedPaymentInstrumentLabel() throws ExecutionException {
+        return mTestCommon.getSelectedPaymentInstrumentLabel();
+    }
+
+    /**  Returns the total amount in order summary section. */
+    protected String getOrderSummaryTotal() throws ExecutionException {
+        return mTestCommon.getOrderSummaryTotal();
+    }
+
     /**
      *  Returns the label corresponding to the contact detail suggestion at the specified
      *  |suggestionIndex|.
      */
     protected String getContactDetailsSuggestionLabel(final int suggestionIndex)
             throws ExecutionException {
         return mTestCommon.getContactDetailsSuggestionLabel(suggestionIndex);
     }
 
     /**  Returns the number of payment instruments. */
@@ skipping 288 matching lines @@
                 base.evaluate();
             }
         }, description);
     }
 
     public interface MainActivityStartCallback {
         void onMainActivityStarted() throws
                 InterruptedException, ExecutionException, TimeoutException;
     }
 }