Allow themes to change the background of the new tab page....

views/widget/default_theme_provider.h

 // Copyright (c) 2009 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 VIEWS_DEFAULT_THEME_PROVIDER_H_
 #define VIEWS_DEFAULT_THEME_PROVIDER_H_
 
 #include "app/theme_provider.h"
 #include "base/basictypes.h"
 
 class ResourceBundle;
 
 namespace views {
 
 class DefaultThemeProvider : public ThemeProvider {
  public:
   DefaultThemeProvider() { };
   virtual ~DefaultThemeProvider() { };
 
   // Overridden from ThemeProvider.
   virtual SkBitmap* GetBitmapNamed(int id);
   virtual SkColor GetColor(int id);
+  virtual bool GetDisplayProperty(int id, int* result);
   virtual bool ShouldUseNativeFrame();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DefaultThemeProvider);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_DEFAULT_THEME_PROVIDER_H_