Close the save card bubble on tab switch.

chrome/browser/ui/views/autofill/save_card_bubble_views.h

 // Copyright 2015 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_AUTOFILL_SAVE_CARD_BUBBLE_VIEWS_H_
 #define CHROME_BROWSER_UI_VIEWS_AUTOFILL_SAVE_CARD_BUBBLE_VIEWS_H_
 
 #include "base/macros.h"
 #include "chrome/browser/ui/autofill/save_card_bubble_controller.h"
 #include "chrome/browser/ui/autofill/save_card_bubble_view.h"
@@ skipping 23 matching lines @@
                             public views::LinkListener,
                             public views::StyledLabelListener {
  public:
   // Bubble will be anchored to |anchor_view|.
   SaveCardBubbleViews(views::View* anchor_view,
                       content::WebContents* web_contents,
                       SaveCardBubbleController* controller);
 
   void Show(DisplayReason reason);
 
+  // Closes the currently shown bubble if one exists.
+  static void CloseBubble();

[Justin Donnelly, 2016/01/07 19:28:12]

The static method is unfortunate given the otherwise nice design of the save
card bubble controller and view but it's how the other bubbles handle this and I
can't find another approach that implements all of the desired behaviors.

I'm open to other suggestions if you have any.

+
   // SaveCardBubbleView
   void Hide() override;
 
   // views::WidgetDelegate
   views::View* GetInitiallyFocusedView() override;
   base::string16 GetWindowTitle() const override;
   bool ShouldShowWindowTitle() const override;
   void WindowClosing() override;
 
   // views::ButtonListener
   void ButtonPressed(views::Button* sender, const ui::Event& event) override;
 
   // views::LinkListener
   void LinkClicked(views::Link* source, int event_flags) override;
 
   // views::StyledLabelListener
   void StyledLabelLinkClicked(views::StyledLabel* label,
                               const gfx::Range& range,
                               int event_flags) override;
 
  private:
   ~SaveCardBubbleViews() override;
 
   scoped_ptr<views::View> CreateMainContentView();
   scoped_ptr<views::View> CreateFootnoteView();
 
   // views::BubbleDelegateView
   void Init() override;
 
+  static SaveCardBubbleViews* save_card_bubble_view_;
+
   SaveCardBubbleController* controller_;  // Weak reference.
 
   // Button for the user to confirm saving the credit card info.
   views::LabelButton* save_button_;
 
   views::LabelButton* cancel_button_;
 
   views::Link* learn_more_link_;
 
   DISALLOW_COPY_AND_ASSIGN(SaveCardBubbleViews);
 };
 
 }  // namespace autofill
 
 #endif  // CHROME_BROWSER_UI_VIEWS_AUTOFILL_SAVE_CARD_BUBBLE_VIEWS_H_