[Payments] Normalize billing address before sending to the merchant.

chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentInstrument.java

Index: chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentInstrument.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentInstrument.java b/chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentInstrument.java
index c799a7814d292cdd7bc2d8c0ae2cbdbe67d61180..2b46ece1bb9e8a072bdeb465f1ae7dbe8aed301b 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentInstrument.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentInstrument.java
@@ -4,11 +4,11 @@
 
 package org.chromium.chrome.browser.payments;
 
+import org.json.JSONObject;
+
 import org.chromium.chrome.browser.payments.ui.PaymentOption;
 import org.chromium.payments.mojom.PaymentItem;
 
-import org.json.JSONObject;
-
 import java.util.List;
 
 /**
@@ -20,6 +20,12 @@ public abstract class PaymentInstrument extends PaymentOption {
      */
     public interface DetailsCallback {
         /**
+         * Called when loading the instrument details to tell the Payment Request UI to show a

[please use gerrit instead, 2016/10/18 17:30:31]

s/when loading the instrument details/by the credit card payment instrument when
CVC has been unmasked, but billing address has not been normalized yet/

[sebsg, 2016/10/18 22:44:31]

This is very specific. I left it more general so it could be used by other
PaymentInstruments while they do some background tasks. You know more about all
of that though so I'll defer to your take on this.

+         * loading UI.
+         */
+        void loadingInstrumentDetails();
+
+        /**
          * Called after retrieving instrument details.
          *
          * @param methodName         Method name. For example, "visa".