[Payments] Don't add expired cards in Payment Request.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorFieldModel.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorFieldModel.java b/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorFieldModel.java
index c299f081a92d33bb59c43d224602aef2a68fa412..4bac0d83f6e0334edef7bde79e3b65e01ec6a0a8 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorFieldModel.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorFieldModel.java
@@ -195,6 +195,27 @@ public class EditorFieldModel {
         return result;
     }
 
+    /**
+    * Constructs a dropdown field model.

[please use gerrit instead, 2016/10/27 00:05:22]

... with a validator.

[sebsg, 2016/10/27 14:38:00]

Done.

+    *
+    * @param label                The human-readable label for user to understand the type of data
+    *                             that should be entered into this field.
+    * @param dropdownKeyValues    The keyed values to display in the dropdown.
+    * @param validator            Optional validator for the values in this field.

[please use gerrit instead, 2016/10/27 00:05:22]

Let's make it non-optional. If the user of this API does not want to have a
validator, they should be using the validator-less function above. Also remove
@Nullable for validator and invalidErrorMessage and add an "assert xyz != null"
in the body of the function.

[sebsg, 2016/10/27 14:38:00]

Done.

+    * @param requiredErrorMessage The optional error message that indicates to the user that they
+    *                             cannot leave this field empty.
+    */

[please use gerrit instead, 2016/10/27 00:05:22]

Comment indent.

[sebsg, 2016/10/27 14:38:00]

Done.

+    public static EditorFieldModel createDropdown(
+            @Nullable CharSequence label, List<DropdownKeyValue> dropdownKeyValues,
+            @Nullable EditorFieldValidator validator,
+            @Nullable CharSequence invalidErrorMessage) {
+        assert dropdownKeyValues != null;
+        EditorFieldModel result = createDropdown(label, dropdownKeyValues);
+        result.mValidator = validator;
+        result.mInvalidErrorMessage = invalidErrorMessage;
+        return result;
+    }
+
     /** Constructs a text input field model without any special text formatting hints. */
     public static EditorFieldModel createTextInput() {
         return new EditorFieldModel(INPUT_TYPE_HINT_NONE);