Implement PaymentRequestUpdateEvent

chrome/android/java/src/org/chromium/chrome/browser/payments/ui/PaymentRequestUI.java

 // Copyright 2016 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.ui;
 
 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
@@ skipping 383 matching lines @@
     }
 
     /**
      * Updates the shipping options in response to a changed shipping address.
      *
      * @param shipping The shipping options.
      */
     public void updateShippingOptionsSection(SectionInformation section) {
         mShippingOptionsSectionInformation = section;
         mShippingOptionSection.update(section);
+        updatePayButtonEnabled();
     }
 
     private void updatePaymentMethodSection(SectionInformation section) {
         mPaymentMethodSectionInformation = section;
         mPaymentMethodSection.update(section);
     }
 
     @Override
     public void onPaymentOptionChanged(OptionSection section, PaymentOption option) {
         if (section == mShippingAddressSection) {
@@ skipping 306 matching lines @@
                 @Override
                 public void onAnimationEnd(Animator animation) {
                     mCurrentAnimator = null;
                     update(0.0f);
                 }
             });
             mCurrentAnimator.start();
         }
     }
 }