Add PanelBrowserTitlebarGtk for panels on GTK.

chrome/browser/ui/panels/panel_browser_titlebar_gtk.h

Index: chrome/browser/ui/panels/panel_browser_titlebar_gtk.h
diff --git a/chrome/browser/ui/panels/panel_browser_titlebar_gtk.h b/chrome/browser/ui/panels/panel_browser_titlebar_gtk.h
new file mode 100644
index 0000000000000000000000000000000000000000..0081215f11d3c6ea54b4f6ce5d9ba114f6063b96
--- /dev/null
+++ b/chrome/browser/ui/panels/panel_browser_titlebar_gtk.h
@@ -0,0 +1,25 @@
+// 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_