Add PanelBrowserTitlebarGtk for panels on GTK.

chrome/browser/ui/panels/panel_browser_titlebar_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_titlebar_gtk.h"
+
+PanelBrowserTitlebarGtk::PanelBrowserTitlebarGtk(
+    BrowserWindowGtk* browser_window, GtkWindow* window)
+    : BrowserTitlebar(browser_window, window) {
+
+}
+
+PanelBrowserTitlebarGtk::~PanelBrowserTitlebarGtk() {
+}
+
+bool PanelBrowserTitlebarGtk::BuildButton(const std::string& button_token,
+                                          bool left_side) {
+  // Panel does not show minimize and maximize buttons.
+  if (button_token == "minimize" || button_token == "maximize")

[jennb, 2012/04/20 22:26:32]

Better to check for the ones we do show in panel and build those. Otherwise, if
new buttons panel doesn't care about are added to tokenizer list in base class,
they will automatically show up for panels.

[jianli, 2012/04/20 23:00:29]

Done.

+    return false;
+
+  return BrowserTitlebar::BuildButton(button_token, left_side);
+}
+
+void PanelBrowserTitlebarGtk::ShowFaviconMenu(GdkEventButton* event) {

[jennb, 2012/04/20 22:26:32]

Should subclass OnFavIconMenuButtonPressed instead?

[jianli, 2012/04/20 23:00:29]

Can't do this because OnFavIconMenuButtonPressed is defined by the macro and I
can't add virtual to it.

+  // Favicon menu is not supported in panels.
+}