Paint solid color backgrounds which are equivalent to locally attached into scrolling contents layer

third_party/WebKit/Source/core/layout/LayoutTheme.h

 /*
  * This file is part of the theme implementation for form controls in WebCore.
  *
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 169 matching lines @@
     virtual String fileListNameForWidth(Locale&, const FileList*, const Font&, int width) const;
 
     virtual bool shouldOpenPickerWithF4Key() const;
 
     virtual bool supportsSelectionForegroundColors() const { return true; }
 
     virtual bool isModalColorChooser() const { return true; }
 
     virtual bool shouldUseFallbackTheme(const ComputedStyle&) const;
 
+    virtual bool themeDrawsFocusRing(const ComputedStyle&) const = 0;
+
 protected:
     // The platform selection color.
     virtual Color platformActiveSelectionBackgroundColor() const;
     virtual Color platformInactiveSelectionBackgroundColor() const;
     virtual Color platformActiveSelectionForegroundColor() const;
     virtual Color platformInactiveSelectionForegroundColor() const;
 
     virtual Color platformActiveListBoxSelectionBackgroundColor() const;
     virtual Color platformInactiveListBoxSelectionBackgroundColor() const;
     virtual Color platformActiveListBoxSelectionForegroundColor() const;
     virtual Color platformInactiveListBoxSelectionForegroundColor() const;
 
-    virtual bool themeDrawsFocusRing(const ComputedStyle&) const = 0;
-
     // Methods for each appearance value.
     virtual void adjustCheckboxStyle(ComputedStyle&) const;
     virtual void setCheckboxSize(ComputedStyle&) const { }
 
     virtual void adjustRadioStyle(ComputedStyle&) const;
     virtual void setRadioSize(ComputedStyle&) const { }
 
     virtual void adjustButtonStyle(ComputedStyle&) const;
     virtual void adjustInnerSpinButtonStyle(ComputedStyle&) const;
 
@@ skipping 37 matching lines @@
     static const RGBA32 defaultTapHighlightColor = 0x66000000;
 
     static const RGBA32 defaultCompositionBackgroundColor = 0xFFFFDD55;
 
     Theme* m_platformTheme; // The platform-specific theme.
 };
 
 } // namespace blink
 
 #endif // LayoutTheme_h