[Web Payments] Initial plumb of Payment Request dialog

chrome/browser/payments/ui/payment_request_dialog.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_PAYMENTS_UI_PAYMENT_REQUEST_DIALOG_H_
+#define CHROME_BROWSER_PAYMENTS_UI_PAYMENT_REQUEST_DIALOG_H_
+
+#include "ui/gfx/canvas.h"
+#include "ui/views/controls/label.h"
+#include "ui/views/layout/box_layout.h"
+#include "ui/views/layout/fill_layout.h"
+#include "ui/views/window/dialog_delegate.h"
+
+// TODO: This should be more specific to the stage of payment collection.
+class PaymentRequestDialog : public views::DialogDelegateView {
+ public:
+  PaymentRequestDialog();
+  ~PaymentRequestDialog() override;
+
+  ui::ModalType GetModalType() const override;
+
+  // We might be able to get rid of this later.
+  gfx::Size GetPreferredSize() const override;
+
+ private:
+  std::unique_ptr<views::Label> label_;
+
+  DISALLOW_COPY_AND_ASSIGN(PaymentRequestDialog);
+};
+
+#endif  // CHROME_BROWSER_PAYMENTS_UI_PAYMENT_REQUEST_DIALOG_H_