Add PanelBrowserTitlebarGtk for panels on GTK.

chrome/browser/ui/panels/panel_browser_titlebar_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_TITLEBAR_GTK_H_
+#define CHROME_BROWSER_UI_PANELS_PANEL_BROWSER_TITLEBAR_GTK_H_
+
+#include "chrome/browser/ui/gtk/browser_titlebar.h"
+
+class PanelBrowserTitlebarGtk : public BrowserTitlebar {
+ public:
+  PanelBrowserTitlebarGtk(BrowserWindowGtk* browser_window, GtkWindow* window);
+  virtual ~PanelBrowserTitlebarGtk();
+
+ protected:
+  // Overridden from BrowserTitlebar:
+  virtual bool BuildButton(const std::string& button_token,
+                           bool left_side) OVERRIDE;
+  virtual void ShowFaviconMenu(GdkEventButton* event) OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PanelBrowserTitlebarGtk);
+};
+
+#endif  // CHROME_BROWSER_UI_PANELS_PANEL_BROWSER_TITLEBAR_GTK_H_