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

components/payments/content/payment_request_spec.h

Index: components/payments/content/payment_request_spec.h
diff --git a/components/payments/content/payment_request_spec.h b/components/payments/content/payment_request_spec.h
index 39bbda8f7bb5bb8bd78cda5aa5a5427c15d348d5..de0187a5aaa7259afcab1281bccf8be0c884232d 100644
--- a/components/payments/content/payment_request_spec.h
+++ b/components/payments/content/payment_request_spec.h
@@ -25,6 +25,14 @@ extern const char kBasicCardMethodName[];
 // certain occasions by the merchant (see API).
 class PaymentRequestSpec : public PaymentOptionsProvider {
  public:
+  // This enum represents which bit of information was changed to trigger an
+  // update roundtrip with the website.
+  enum class UpdateReason {
+    NONE,
+    SHIPPING_OPTION,
+    SHIPPING_ADDRESS,
+  };
+
   // Any class call add itself as Observer via AddObserver() and receive
   // notification about spec events.
   class Observer {
@@ -32,6 +40,11 @@ class PaymentRequestSpec : public PaymentOptionsProvider {
     // Called when the provided spec (details, options, method_data) is invalid.
     virtual void OnInvalidSpecProvided() = 0;
 
+    // Called when the website is notified that the user selected shipping
+    // options or a shipping address. This will be followed by a call to
+    // OnSpecUpdated or the PaymentRequest being aborted due to a timeout.
+    virtual void OnStartUpdating(UpdateReason reason) {}
+
     // Called when the provided spec has changed.
     virtual void OnSpecUpdated() = 0;
 
@@ -87,6 +100,8 @@ class PaymentRequestSpec : public PaymentOptionsProvider {
 
   const mojom::PaymentDetails& details() const { return *details_.get(); }
 
+  void StartWaitingForUpdateWith(UpdateReason reason);
+
  private:
   friend class PaymentRequestDialogView;
   void add_observer_for_testing(Observer* observer_for_testing) {