Implement basic theming for panel titlebars.

chrome/browser/ui/cocoa/themed_browser_window.h

Index: chrome/browser/ui/cocoa/themed_browser_window.h
diff --git a/chrome/browser/ui/cocoa/themed_browser_window.h b/chrome/browser/ui/cocoa/themed_browser_window.h
new file mode 100644
index 0000000000000000000000000000000000000000..0034cd874dc56828247796adc86007d6d524660d
--- /dev/null
+++ b/chrome/browser/ui/cocoa/themed_browser_window.h
@@ -0,0 +1,19 @@
+// Copyright (c) 2010 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_COCOA_THEMED_BROWSER_WINDOW_H_
+#define CHROME_BROWSER_UI_COCOA_THEMED_BROWSER_WINDOW_H_
+#pragma once
+
+#import <Cocoa/Cocoa.h>
+
+#include "chrome/browser/ui/cocoa/chrome_event_processing_window.h"
+
+// Common base class for themed browser windows.
+@interface ThemedBrowserWindow : ChromeEventProcessingWindow {
+}
+
+@end
+
+#endif  // CHROME_BROWSER_UI_COCOA_CHROME_BROWSER_WINDOW_H_