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

chrome/browser/ui/gtk/browser_titlebar_throbber.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_THROBBER_H_
+#define CHROME_BROWSER_UI_GTK_BROWSER_TITLEBAR_THROBBER_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "ui/gfx/gtk_util.h"
+
+// A helper class to keep track of which frame of the throbber animation
+// we're showing.
+class BrowserTitlebarThrobber {
+ public:
+  BrowserTitlebarThrobber();
+
+  // Get the next frame in the animation. The image is owned by the throbber
+  // so the caller doesn't need to unref.  |is_waiting| is true if we're

[Evan Stade, 2012/06/04 22:58:19]

nit: one space after .

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

Done.

+  // still waiting for a response.
+  GdkPixbuf* GetNextFrame(bool is_waiting);
+
+  // Reset back to the first frame.
+  void Reset();
+
+ private:
+  // Make sure the frames are loaded.
+  static void InitFrames();
+
+  int current_frame_;
+  int current_waiting_frame_;
+
+  DISALLOW_COPY_AND_ASSIGN(BrowserTitlebarThrobber);
+};
+
+#endif  // CHROME_BROWSER_UI_GTK_BROWSER_TITLEBAR_THROBBER_H_