Add VectorIconButton functionality to ImageButton.

ash/common/wm/overview/window_selector_item.h

 // Copyright 2013 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 ASH_COMMON_WM_OVERVIEW_WINDOW_SELECTOR_ITEM_H_
 #define ASH_COMMON_WM_OVERVIEW_WINDOW_SELECTOR_ITEM_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
 #include "ash/common/wm/overview/scoped_transform_overview_window.h"
 #include "base/macros.h"
 #include "ui/aura/window_observer.h"
 #include "ui/gfx/geometry/insets.h"
 #include "ui/gfx/geometry/rect.h"
-#include "ui/views/controls/button/button.h"
 #include "ui/views/controls/button/image_button.h"
 #include "ui/views/controls/label.h"
 #include "ui/views/widget/widget.h"
 
 namespace gfx {
 class SlideAnimation;
 }
 
-namespace views {
-class ImageButton;
-}
-
 namespace ash {
 
 class WindowSelector;
 class WmWindow;
 
 // This class represents an item in overview mode.
-class ASH_EXPORT WindowSelectorItem : public views::ButtonListener,
+class ASH_EXPORT WindowSelectorItem : public views::ImageButtonDelegate,
                                       public aura::WindowObserver {
  public:
   // An image button with a close window icon.
   class OverviewCloseButton : public views::ImageButton {
    public:
-    explicit OverviewCloseButton(views::ButtonListener* listener);
+    explicit OverviewCloseButton(views::ImageButtonDelegate* listener);
     ~OverviewCloseButton() override;
 
     // Resets the listener so that the listener can go out of scope.
     void ResetListener() { listener_ = nullptr; }
 
    private:
     DISALLOW_COPY_AND_ASSIGN(OverviewCloseButton);
   };
 
   WindowSelectorItem(WmWindow* window, WindowSelector* window_selector);
@@ skipping 55 matching lines @@
   // Called when the window is minimized or unminimized.
   void OnMinimizedStateChanged();
 
   // Sets if the item is dimmed in the overview. Changing the value will also
   // change the visibility of the transform windows.
   void SetDimmed(bool dimmed);
   bool dimmed() const { return dimmed_; }
 
   const gfx::Rect& target_bounds() const { return target_bounds_; }
 
-  // views::ButtonListener:
+  // views::ImageButtonDelegate:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override;
 
   // aura::WindowObserver:
   void OnWindowDestroying(aura::Window* window) override;
   void OnWindowTitleChanged(aura::Window* window) override;
 
  private:
   class CaptionContainerView;
   class RoundedContainerView;
   friend class WindowSelectorTest;
@@ skipping 87 matching lines @@
   // corners. This view can have its color and opacity animated. It has a layer
   // which is the only textured layer used by the |item_widget_|.
   RoundedContainerView* background_view_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowSelectorItem);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_OVERVIEW_WINDOW_SELECTOR_ITEM_H_