Change the visual appearance of panel on GTK per new UI design.

chrome/browser/ui/gtk/browser_titlebar_base.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_GTK_BROWSER_TITLEBAR_BASE_H_
+#define CHROME_BROWSER_UI_GTK_BROWSER_TITLEBAR_BASE_H_
+#pragma once
+
+#include <gtk/gtk.h>
+
+#include "base/compiler_specific.h"
+
+class AvatarMenuButtonGtk;
+
+namespace content {
+class WebContents;
+}
+
+class BrowserTitlebarBase {

[jennb, 2012/06/04 22:17:52]

Is there anything browser-specific about this titlebar? If not, suggest dropping
Browser from the name so that there's no confusion when we create
browserless-panels that use this class.

Ditto for BrowserTitlebarThrobber.

[jianli, 2012/06/05 18:48:30]

This base file is a temporary solution so that BrowserWindowGtk can call those
methods provided in BrowserTitlebar/PanelBrowserTitlebarGtk. I will remove this
base file when we implement panel window for gtk that does not depend on
browser. So I rather keep all the names unchanged.

+ public:
+  virtual ~BrowserTitlebarBase() { }
+
+  // Build the titlebar, the space above the tab strip, and (maybe) the min,

[jennb, 2012/06/04 22:17:52]

tab strip is browser-specific. Please put those specifics into the appropriate
subclass. Several other comments in this file also refer to behavior that is
specific to how a subclass might implement the method. Please move those as
well.

[jianli, 2012/06/05 18:48:30]

Ditto. I rather keep as it is now so that we can move the original comments back
to their original file.

+  // max, close buttons.
+  virtual void Init() = 0;
+
+  // Updates the title and icon when in app or popup/panel mode (no tabstrip).
+  virtual void UpdateTitleAndIcon() = 0;
+
+  // Update the appearance of the title bar based on whether we're showing a
+  // custom frame or not.  If |use_custom_frame| is true, we show an extra
+  // tall titlebar and the min/max/close buttons.
+  virtual void UpdateCustomFrame(bool use_custom_frame) = 0;
+
+  // Called by the browser asking us to update the loading throbber.
+  // |web_contents| is the tab that is associated with the window throbber.
+  // |web_contents| can be null.
+  virtual void UpdateThrobber(content::WebContents* web_contents) = 0;
+
+  // On Windows, right clicking in the titlebar background brings up the system
+  // menu.  There's no such thing on linux, so we just show the menu items we
+  // add to the menu.
+  virtual void ShowContextMenu(GdkEventButton* event) = 0;
+
+  virtual GtkWidget* widget() const = 0;
+  virtual void set_window(GtkWindow* window) = 0;
+  virtual AvatarMenuButtonGtk* avatar_button() const = 0;
+};
+
+#endif  // CHROME_BROWSER_UI_GTK_BROWSER_TITLEBAR_BASE_H_