[Payments] Display the shipping option error alongside the address

chrome/browser/ui/views/payments/payment_request_item_list.h

Index: chrome/browser/ui/views/payments/payment_request_item_list.h
diff --git a/chrome/browser/ui/views/payments/payment_request_item_list.h b/chrome/browser/ui/views/payments/payment_request_item_list.h
index b2d360ed2b91eec7c9bed453d070be6b67b81f53..dee0a8a6855489b2f651e075e9ef95d4769a55e2 100644
--- a/chrome/browser/ui/views/payments/payment_request_item_list.h
+++ b/chrome/browser/ui/views/payments/payment_request_item_list.h
@@ -76,10 +76,14 @@ class PaymentRequestItemList {
     // item's view, such as the credit card icon.
     virtual std::unique_ptr<views::View> CreateExtraView();
 
+    // Whether the item should be enabled (if disabled, the user will not be
+    // able to click on the item).
+    virtual bool IsEnabled() = 0;
+
     // Returns whether this item is complete/valid and can be selected by the
     // user. If this returns false when the user attempts to select this item,
     // PerformSelectionFallback will be called instead.
-    virtual bool CanBeSelected() const = 0;
+    virtual bool CanBeSelected() = 0;
 
     // Performs the action that replaces selection when CanBeSelected returns
     // false. This will usually be to display an editor.