enable modifiers for native apps

chrome/android/javatests/src/org/chromium/chrome/browser/payments/PaymentRequestTestCommon.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 static java.util.Arrays.asList;
 
 import android.os.Handler;
 import android.view.KeyEvent;
@@ skipping 320 matching lines @@
             @Override
             public String call() {
                 return ((OptionSection) mUI.getPaymentMethodSectionForTest())
                         .getOptionLabelsForTest(index)
                         .getText()
                         .toString();
             }
         });
     }
 
+    protected String getSelectedPaymentInstrumentLabel() throws ExecutionException {
+        return ThreadUtils.runOnUiThreadBlocking(new Callable<String>() {
+            @Override
+            public String call() {
+                OptionSection section = ((OptionSection) mUI.getPaymentMethodSectionForTest());
+                int size = section.getNumberOfOptionLabelsForTest();
+                for (int i = 0; i < size; i++) {
+                    if (section.getOptionRowAtIndex(i).isChecked()) {
+                        return section.getOptionRowAtIndex(i).getLabelText().toString();
+                    }
+                }
+                return null;
+            }
+        });
+    }
+
+    protected String getOrderSummaryTotal() throws ExecutionException {
+        return ThreadUtils.runOnUiThreadBlocking(new Callable<String>() {
+            @Override
+            public String call() {
+                return mUI.getOrderSummaryTotalTextViewForTest().getText().toString();
+            }
+        });
+    }
+
     protected String getContactDetailsSuggestionLabel(final int suggestionIndex)
             throws ExecutionException {
         return ThreadUtils.runOnUiThreadBlocking(new Callable<String>() {
             @Override
             public String call() {
                 return ((OptionSection) mUI.getContactDetailsSectionForTest())
                         .getOptionLabelsForTest(suggestionIndex)
                         .getText()
                         .toString();
             }
@@ skipping 607 matching lines @@
     }
 
     public interface PaymentRequestTestCommonCallback {
         ChromeTabbedActivity getActivity();
         void onMainActivityStarted()
                 throws InterruptedException, ExecutionException, TimeoutException;
         void startMainActivityWithURL(String url) throws InterruptedException;
         void assertWaitForPageScaleFactorMatch(float expectedScale);
     }
 }