Verify behavior of PaymentRequest constructor.

third_party/WebKit/Source/modules/payments/PaymentsValidators.cpp

 // 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.
 
 #include "modules/payments/PaymentsValidators.h"
 
 #include "bindings/core/v8/ScriptRegexp.h"
 #include "platform/weborigin/KURL.h"
 #include "platform/wtf/text/StringImpl.h"
 
@@ skipping 30 matching lines @@
     return true;
 
   if (optional_error_message)
     *optional_error_message =
         "The currency code should be at most 2048 characters long";
 
   return false;
 }
 
 bool PaymentsValidators::IsValidAmountFormat(const String& amount,
+                                             const String& item_name,
                                              String* optional_error_message) {
   if (ScriptRegexp("^-?[0-9]+(\\.[0-9]+)?$", kTextCaseSensitive)
           .Match(amount) == 0)
     return true;
 
-  if (optional_error_message)
-    *optional_error_message = "'" + amount + "' is not a valid amount format";
+  if (optional_error_message) {
+    *optional_error_message =
+        "'" + amount + "' is not a valid amount format for " + item_name;
+  }
 
   return false;
 }
 
 bool PaymentsValidators::IsValidCountryCodeFormat(
     const String& code,
     String* optional_error_message) {
   if (ScriptRegexp("^[A-Z]{2}$", kTextCaseSensitive).Match(code) == 0)
     return true;
 
@@ skipping 66 matching lines @@
     return true;
 
   if (optional_error_message)
     *optional_error_message =
         "Error message should be at most 2048 characters long";
 
   return false;
 }
 
 }  // namespace blink