[WebPayments] Setting hidden views in view stack invisible

chrome/browser/ui/views/payments/view_stack.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_VIEW_STACK_H_
 #define CHROME_BROWSER_UI_VIEWS_PAYMENTS_VIEW_STACK_H_
 
 #include <vector>
 
 #include "ui/views/view.h"
@@ skipping 43 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(ViewStackTest, TestDeletingViewCleansUpState);
   FRIEND_TEST_ALL_PREFIXES(ViewStackTest, TestInitialStateAddedAsChildView);
   FRIEND_TEST_ALL_PREFIXES(ViewStackTest, TestPushStateAddsViewToChildren);
   FRIEND_TEST_ALL_PREFIXES(ViewStackTest, TestLayoutUpdatesAnimations);
   friend class ViewStackTest;
   friend class payments::PaymentRequestBrowserTestBase;
 
   // Returns the top state of the stack, used in tests.
   views::View* top() { return stack_.back().get(); }
 
+  // Marks all views, except the topmost, as invisible.
+  void HideCoveredViews();
+
   void UpdateAnimatorBounds(
       views::BoundsAnimator* animator, const gfx::Rect& target);
 
   // views::BoundsAnimatorObserver:
   void OnBoundsAnimatorProgressed(views::BoundsAnimator* animator) override {}
   void OnBoundsAnimatorDone(views::BoundsAnimator* animator) override;
 
   std::unique_ptr<views::BoundsAnimator> slide_in_animator_;
   std::unique_ptr<views::BoundsAnimator> slide_out_animator_;
 
   // Should be the last member, because views need to be destroyed before other
   // members, and members are destroyed in reverse order of their creation.
   std::vector<std::unique_ptr<views::View>> stack_;
 
   DISALLOW_COPY_AND_ASSIGN(ViewStack);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_PAYMENTS_VIEW_STACK_H_