[Web Payments] Add Spinners and timeout while waiting for UpdateWith

components/payments/content/payment_request_spec.cc

 // 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 "components/payments/content/payment_request_spec.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "components/payments/core/payment_method_data.h"
@@ skipping 109 matching lines @@
 }
 
 std::string PaymentRequestSpec::GetFormattedCurrencyCode() {
   CurrencyFormatter* formatter = GetOrCreateCurrencyFormatter(
       details_->total->amount->currency,
       details_->total->amount->currency_system, app_locale_);
 
   return formatter->formatted_currency_code();
 }
 
+void PaymentRequestSpec::StartWaitingForUpdateWith(
+    PaymentRequestSpec::UpdateReason reason) {
+  for (auto& observer : observers_) {
+    observer.OnStartUpdating(reason);
+  }
+}
+
 void PaymentRequestSpec::PopulateValidatedMethodData(
     const std::vector<mojom::PaymentMethodDataPtr>& method_data_mojom) {
   if (method_data_mojom.empty()) {
     LOG(ERROR) << "Invalid payment methods or data";
     NotifyOnInvalidSpecProvided();
     return;
   }
 
   std::vector<PaymentMethodData> method_data_vector;
   method_data_vector.reserve(method_data_mojom.size());
@@ skipping 64 matching lines @@
     const std::string& currency_system,
     const std::string& locale_name) {
   if (!currency_formatter_) {
     currency_formatter_.reset(
         new CurrencyFormatter(currency_code, currency_system, locale_name));
   }
   return currency_formatter_.get();
 }
 
 }  // namespace payments