[Payments] Move PaymentResponse logic to PaymentResponseHelper.

components/payments/content/payment_response_helper.h

Index: components/payments/content/payment_response_helper.h
diff --git a/components/payments/content/payment_response_helper.h b/components/payments/content/payment_response_helper.h
index 0912302ac5c2cfd3c0499bbb6750bae0e6b866a4..c8903e22b92dd8ae2c8f0ba7ee490db7f7e4eeeb 100644
--- a/components/payments/content/payment_response_helper.h
+++ b/components/payments/content/payment_response_helper.h
@@ -7,6 +7,7 @@
 
 #include "base/macros.h"
 #include "components/payments/content/payment_request.mojom.h"
+#include "components/payments/core/payment_instrument.h"
 
 namespace autofill {
 class AutofillProfile;
@@ -14,21 +15,54 @@ class AutofillProfile;
 
 namespace payments {
 
-// TODO(sebsg): Accept PaymentInstrument and handle generating the payment
-// aspect of the PaymentResponse in this class.
+class PaymentRequestSpec;
+
 // TODO(sebsg): Asynchronously normalize the billing and shipping addresses
 // before adding them to the PaymentResponse.
 // A helper class to facilitate the creation of the PaymentResponse.
-class PaymentResponseHelper {
+class PaymentResponseHelper : public PaymentInstrument::Delegate {
  public:
-  PaymentResponseHelper();
-  ~PaymentResponseHelper();
+  class Delegate {
+   public:
+    virtual ~Delegate() {}
+
+    virtual void OnPaymentResponseReady(
+        mojom::PaymentResponsePtr payment_response) = 0;
+  };
 
+  // The spec, selected_instrument and delegate cannot be null.
+  PaymentResponseHelper(const std::string& app_locale,
+                        PaymentRequestSpec* spec,
+                        PaymentInstrument* selected_instrument,
+                        autofill::AutofillProfile* selected_shipping_profile,
+                        autofill::AutofillProfile* selected_contact_profile,
+                        Delegate* delegate);
+  ~PaymentResponseHelper() override;
+
+  // Returns a new mojo PaymentAddress based on the specified
+  // |profile| and |app_locale|.
   static mojom::PaymentAddressPtr GetMojomPaymentAddressFromAutofillProfile(
       const autofill::AutofillProfile* const profile,
       const std::string& app_locale);
 
+  // PaymentInstrument::Delegate
+  void OnInstrumentDetailsReady(
+      const std::string& method_name,
+      const std::string& stringified_details) override;
+  void OnInstrumentDetailsError() override {}
+
  private:
+  const std::string& app_locale_;
+
+  // Not owned, cannot be null.
+  PaymentRequestSpec* spec_;
+  Delegate* delegate_;
+  PaymentInstrument* selected_instrument_;
+
+  // Not owned, can be null (dependent on the spec).
+  autofill::AutofillProfile* selected_shipping_profile_;
+  autofill::AutofillProfile* selected_contact_profile_;
+
   DISALLOW_COPY_AND_ASSIGN(PaymentResponseHelper);
 };