Update Panel mininimize/restore button on strip and expansion state change.

chrome/browser/ui/panels/native_panel.h

 // Copyright (c) 2012 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_PANELS_NATIVE_PANEL_H_
 #define CHROME_BROWSER_UI_PANELS_NATIVE_PANEL_H_
 #pragma once
 
 #include "chrome/browser/ui/panels/panel.h"
 #include "ui/gfx/native_widget_types.h"
@@ skipping 63 matching lines @@
       const gfx::Size& content_size) const = 0;
   virtual gfx::Size ContentSizeFromWindowSize(
       const gfx::Size& window_size) const = 0;
 
   virtual int TitleOnlyHeight() const = 0;
 
   // Brings the panel to the top of the z-order without activating it. This
   // will make sure that the panel is not obscured by other top-most windows.
   virtual void EnsurePanelFullyVisible() = 0;
 
-  // Sets whether the panel app icon is visible (usually refers to the app icons
-  // in the desktop bar).
-  virtual void SetPanelAppIconVisibility(bool visible) = 0;
-
   // Sets whether the panel window is always on top.
   virtual void SetPanelAlwaysOnTop(bool on_top) = 0;
 
   // Enables resizing by dragging edges/corners.
   virtual void EnableResizeByMouse(bool enable) = 0;
+
+  // Updates the visibility of the minimize and restore buttons.
+  virtual void UpdatePanelMinimizeRestoreButtonVisibility() = 0;
 };
 
 // A NativePanel utility interface used for accessing elements of the
 // native panel used only by test automation.
 class NativePanelTesting {
  public:
   enum TitlebarButtonType {
     CLOSE_BUTTON,
     MINIMIZE_BUTTON,
     RESTORE_BUTTON
@@ skipping 25 matching lines @@
   // active, i.e. the titlebar is painted per its active state.
   virtual bool VerifyActiveState(bool is_active) = 0;
   virtual void WaitForWindowCreationToComplete() const { }
 
   virtual bool IsWindowSizeKnown() const = 0;
   virtual bool IsAnimatingBounds() const = 0;
   virtual bool IsButtonVisible(TitlebarButtonType button_type) const = 0;
 };
 
 #endif  // CHROME_BROWSER_UI_PANELS_NATIVE_PANEL_H_