[Payments] Hide 'Add card' button when cards are not supported.

Bug: 781291
Change-Id: I4405edc4e76f3c00b4ea83eab07b3387edc7a80f
Reviewed-on: https://chromium-review.googlesource.com/849155Reviewed-by: anthonyvd <anthonyvd@chromium.org>
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526734}

chrome/browser/ui/views/payments/payment_method_view_controller.cc

@@ -229,6 +229,9 @@ void PaymentMethodViewController::FillContentView(views::View* content_view) {
 
 std::unique_ptr<views::View>
 PaymentMethodViewController::CreateExtraFooterView() {
+  if (!spec()->supports_basic_card())
+    return nullptr;
+
   auto extra_view = base::MakeUnique<views::View>();
 
   extra_view->SetLayoutManager(std::make_unique<views::BoxLayout>(

components/payments/content/payment_request_spec.h

@@ -82,6 +82,8 @@ class PaymentRequestSpec : public PaymentOptionsProvider {
   bool request_payer_email() const override;
   PaymentShippingType shipping_type() const override;
 
+  bool supports_basic_card() const { return !supported_card_networks_.empty(); }
+
   const std::vector<std::string>& supported_card_networks() const {
     return supported_card_networks_;
   }