[Web Payments] Implement proper focusing in Payment Request

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_REQUEST_DIALOG_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_REQUEST_DIALOG_VIEW_H_
 
 #include <map>
 #include <memory>
 
@@ skipping 63 matching lines @@
 
   // Build a Dialog around the PaymentRequest object. |observer| is used to
   // be notified of dialog events as they happen (but may be NULL) and should
   // outlive this object.
   PaymentRequestDialogView(PaymentRequest* request,
                            PaymentRequestDialogView::ObserverForTest* observer);
   ~PaymentRequestDialogView() override;
 
   // views::WidgetDelegate:
   ui::ModalType GetModalType() const override;
+  views::View* GetInitiallyFocusedView() override;
 
   // views::DialogDelegate:
   bool Cancel() override;
   bool ShouldShowCloseButton() const override;
   int GetDialogButtons() const override;
 
   // payments::PaymentRequestDialog:
   void ShowDialog() override;
   void CloseDialog() override;
   void ShowErrorMessage() override;
@@ skipping 69 matching lines @@
   // Used when the dialog is being closed to avoid re-entrancy into the
   // controller_map_.
   bool being_closed_;
 
   DISALLOW_COPY_AND_ASSIGN(PaymentRequestDialogView);
 };
 
 }  // namespace payments
 
 #endif  // CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_REQUEST_DIALOG_VIEW_H_