Fix bug 105043: Panels [WIN]: For minimize panels, taskbar hover preview show the 4-pixel represent…

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 50 matching lines @@
   virtual void PanelCopy() = 0;
   virtual void PanelPaste() = 0;
   virtual void DrawAttention(bool draw_attention) = 0;
   virtual bool IsDrawingAttention() const = 0;
   virtual bool PreHandlePanelKeyboardEvent(
       const content::NativeWebKeyboardEvent& event,
       bool* is_keyboard_shortcut) = 0;
   virtual void HandlePanelKeyboardEvent(
       const content::NativeWebKeyboardEvent& event) = 0;
   virtual void FullScreenModeChanged(bool is_full_screen) = 0;
+  virtual void PanelExpansionStateChanging(Panel::ExpansionState old_state,
+                                           Panel::ExpansionState new_state) = 0;
 
   virtual Browser* GetPanelBrowser() const = 0;
   virtual void DestroyPanelBrowser() = 0;
 
   // Returns the exterior size of the panel window given the client content
   // size and vice versa.
   virtual gfx::Size WindowSizeFromContentSize(
       const gfx::Size& content_size) const = 0;
   virtual gfx::Size ContentSizeFromWindowSize(
       const gfx::Size& window_size) const = 0;
@@ skipping 50 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_