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

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

Index: chrome/browser/ui/views/payments/payment_sheet_view_controller.h
diff --git a/chrome/browser/ui/views/payments/payment_sheet_view_controller.h b/chrome/browser/ui/views/payments/payment_sheet_view_controller.h
index 430b04ca10f79fe0037b848a630b597d22b80029..bf202f2119edc97eb2c4936d883f35b3ba1756ac 100644
--- a/chrome/browser/ui/views/payments/payment_sheet_view_controller.h
+++ b/chrome/browser/ui/views/payments/payment_sheet_view_controller.h
@@ -30,6 +30,7 @@ class PaymentSheetViewController : public PaymentRequestSheetController,
 
   // PaymentRequestSpec::Observer:
   void OnInvalidSpecProvided() override {}
+  void OnStartUpdating(PaymentRequestSpec::UpdateReason reason) override;
   void OnSpecUpdated() override;
 
   // PaymentRequestState::Observer:
@@ -57,6 +58,7 @@ class PaymentSheetViewController : public PaymentRequestSheetController,
   views::Button* pay_button_;
 
   const int widest_name_column_view_width_;
+  PaymentRequestSpec::UpdateReason current_update_reason_;
 
   DISALLOW_COPY_AND_ASSIGN(PaymentSheetViewController);
 };