GTK: Use IDR_THEME_WINDOW_CONTROL_BACKGROUND when drawing min/max/close and new tab buttons.

chrome/browser/ui/gtk/browser_titlebar.h

 // Copyright (c) 2011 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.
 //
 // A helper class that contains the gtk widgets that make up the titlebar.  The
 // titlebar consists of the tabstrip and if the custom chrome frame is turned
 // on, it includes the taller titlebar and minimize, restore, maximize, and
 // close buttons.
 
 #ifndef CHROME_BROWSER_UI_GTK_BROWSER_TITLEBAR_H_
@@ skipping 31 matching lines @@
 
   GtkWidget* widget() {
     return container_;
   }
 
   void set_window(GtkWindow* window) { window_ = window; }
 
   // Builds the buttons based on the metacity |button_string|.
   void BuildButtons(const std::string& button_string);
 
+  // Updates the theme supplied background color and image.
+  void UpdateButtonBackground(CustomDrawButton* button);
+
   // 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.
   void UpdateCustomFrame(bool use_custom_frame);
 
   // Updates the title and icon when in app or popup mode (no tabstrip).
   void UpdateTitleAndIcon();
 
   // Called by the browser asking us to update the loading throbber.
   // |tab_contents| is the tab that is associated with the window throbber.
@@ skipping 102 matching lines @@
   // SimpleMenuModel::Delegate implementation:
   virtual bool IsCommandIdEnabled(int command_id) const;
   virtual bool IsCommandIdChecked(int command_id) const;
   virtual void ExecuteCommand(int command_id);
   virtual bool GetAcceleratorForCommandId(int command_id,
                                           ui::Accelerator* accelerator);
 
   // Overridden from content::NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
-                       const content::NotificationDetails& details);
+                       const content::NotificationDetails& details) OVERRIDE;
 
   // Overriden from ActiveWindowWatcher::Observer.
   virtual void ActiveWindowChanged(GdkWindow* active_window);
 
   bool IsTypePanel();
 
   // Whether to display the avatar image.
   bool ShouldDisplayAvatar();
 
   // Returns true if the profile associated with this BrowserWindow is off the
@@ skipping 88 matching lines @@
   // The avatar button.
   scoped_ptr<AvatarMenuButtonGtk> avatar_button_;
 
   // Theme provider for building buttons.
   GtkThemeService* theme_service_;
 
   content::NotificationRegistrar registrar_;
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_BROWSER_TITLEBAR_H_