[Web Payments] Implement proper focusing in Payment Request

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

Index: chrome/browser/ui/views/payments/payment_request_row_view.h
diff --git a/chrome/browser/ui/views/payments/payment_request_row_view.h b/chrome/browser/ui/views/payments/payment_request_row_view.h
index e9829db41cbf030cb48498805878cfd750bb41f7..7968f942c74375081364a37e7cb7043db931edab 100644
--- a/chrome/browser/ui/views/payments/payment_request_row_view.h
+++ b/chrome/browser/ui/views/payments/payment_request_row_view.h
@@ -19,10 +19,18 @@ class PaymentRequestRowView : public views::CustomButton {
   PaymentRequestRowView(views::ButtonListener* listener, bool clickable);
   ~PaymentRequestRowView() override;
 
+ private:
+  // Sets this row's background to the theme's hovered color to indicate that
+  // it's begin hovered or it's focused.
+  void SetActiveBackground();
+
   // views::CustomButton:
   void StateChanged(ButtonState old_state) override;
 
- private:
+  // views::View:
+  void OnFocus() override;
+  void OnBlur() override;
+
   bool clickable_;
 
   DISALLOW_COPY_AND_ASSIGN(PaymentRequestRowView);