Add PanelBrowserTitlebarGtk for panels on GTK.

chrome/browser/ui/panels/panel_browser_window_gtk.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_PANEL_BROWSER_WINDOW_GTK_H_
 #define CHROME_BROWSER_UI_PANELS_PANEL_BROWSER_WINDOW_GTK_H_
 
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop.h"
 #include "chrome/browser/ui/gtk/browser_window_gtk.h"
@@ skipping 20 matching lines @@
   virtual void SetBounds(const gfx::Rect& bounds) OVERRIDE;
   virtual TitleDecoration GetWindowTitle(std::string* title) const OVERRIDE;
 
   // Overrides BrowserWindowGtk::NotificationObserver::Observe
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
  protected:
   // BrowserWindowGtk overrides
+  virtual BrowserTitlebar* CreateBrowserTitlebar() OVERRIDE;
   virtual bool GetWindowEdge(int x, int y, GdkWindowEdge* edge) OVERRIDE;
   virtual bool HandleTitleBarLeftMousePress(
       GdkEventButton* event,
       guint32 last_click_time,
       gfx::Point last_click_position) OVERRIDE;
   virtual bool HandleWindowEdgeLeftMousePress(
       GtkWindow* window,
       GdkWindowEdge edge,
       GdkEventButton* event) OVERRIDE;
   virtual void SaveWindowPosition() OVERRIDE;
@@ skipping 104 matching lines @@
   // current one completes. In this case, we want to start the new animation
   // from where the last one left.
   gfx::Rect last_animation_progressed_bounds_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(PanelBrowserWindowGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_BROWSER_WINDOW_GTK_H_