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

chrome/browser/ui/panels/panel_browser_window_gtk.cc

 // 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.
 
 #include "chrome/browser/ui/panels/panel_browser_window_gtk.h"
 
 #include "base/bind.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/gtk/browser_titlebar.h"
 #include "chrome/browser/ui/gtk/custom_button.h"
@@ skipping 555 matching lines @@
 gboolean PanelBrowserWindowGtk::OnTitlebarButtonReleaseEvent(
     GtkWidget* widget, GdkEventButton* event) {
   if (event->button != 1)
     return TRUE;
 
   panel_->OnTitlebarClicked((event->state & GDK_CONTROL_MASK) ?
                             panel::APPLY_TO_ALL : panel::NO_MODIFIER);
   return TRUE;
 }
 
+void PanelBrowserWindowGtk::PanelExpansionStateChanging(
+    Panel::ExpansionState old_state, Panel::ExpansionState new_state) {
+}
+
 // NativePanelTesting implementation.
 class NativePanelTestingGtk : public NativePanelTesting {
  public:
   explicit NativePanelTestingGtk(
       PanelBrowserWindowGtk* panel_browser_window_gtk);
 
  private:
   virtual void PressLeftMouseButtonTitlebar(
       const gfx::Point& mouse_location, panel::ClickModifier modifier) OVERRIDE;
   virtual void ReleaseMouseButtonTitlebar(
@@ skipping 122 matching lines @@
       break;
     case RESTORE_BUTTON:
       button = titlebar->unminimize_button();
       break;
     default:
       NOTREACHED();
       return false;
   }
   return gtk_widget_get_visible(button->widget());
 }