[Web Payments] Add Cancel button to all sheets

chrome/browser/ui/views/payments/payment_request_views_util.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_VIEWS_UTIL_H_
 #define CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_REQUEST_VIEWS_UTIL_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 32 matching lines @@
 // +---------------------------+
 std::unique_ptr<views::View> CreateSheetHeaderView(
     bool show_back_arrow,
     const base::string16& title,
     views::VectorIconButtonDelegate* delegate);
 
 // Creates a view to be displayed in the PaymentRequestDialog.
 // |header_view| is the view displayed on top of the dialog, containing title,
 // (optional) back button, and close buttons.
 // |content_view| is displayed between |header_view| and the pay/cancel buttons.
-// The returned view takes ownership of |header_view| and |content_view|.
+// |buttons_view| is clamped to the bottom of the containing view.
+// The returned view takes ownership of |header_view|, |content_view|, and
+// |buttons_view|.
 // +---------------------------+
 // |        HEADER VIEW        |
 // +---------------------------+
 // |          CONTENT          |
 // |           VIEW            |
 // +---------------------------+
-// |            | CANCEL | PAY |
+// |            | CANCEL | PAY | <-- |buttons_view|
 // +---------------------------+
 std::unique_ptr<views::View> CreatePaymentView(
     std::unique_ptr<views::View> header_view,
-    std::unique_ptr<views::View> content_view);
+    std::unique_ptr<views::View> content_view,
+    std::unique_ptr<views::View> buttons_view);
 
 // Represents formatting options for each of the different contexts in which an
 // Address label may be displayed.
 enum class AddressStyleType { SUMMARY, DETAILED };
 
 // Extracts and formats descriptive text from the given |profile| to represent
 // the address in the context specified by |type|.
 std::unique_ptr<views::View> GetShippingAddressLabel(
     AddressStyleType type,
     const std::string& locale,
@@ skipping 10 matching lines @@
     bool show_payer_email,
     bool show_payer_phone);
 
 // Creates a views::Border object that can paint the gray horizontal ruler used
 // as a separator between items in the Payment Request dialog.
 std::unique_ptr<views::Border> CreatePaymentRequestRowBorder();
 
 }  // namespace payments
 
 #endif  // CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_REQUEST_VIEWS_UTIL_H_