Enable proper zooming of checkbox and radio button on Win and Mac.

Source/core/rendering/RenderTheme.h

Index: Source/core/rendering/RenderTheme.h
diff --git a/Source/core/rendering/RenderTheme.h b/Source/core/rendering/RenderTheme.h
index db3953ad3bc9a4f5a539db74f66924c5e7e04990..d95d308e60154b27964d1e9ec3dfb63190058f03 100644
--- a/Source/core/rendering/RenderTheme.h
+++ b/Source/core/rendering/RenderTheme.h
@@ -62,6 +62,8 @@ public:
         return themeForPage(0);
     };
 
+    static void setSizeIfAuto(RenderStyle*, const IntSize&);
+
     // This method is called whenever style has been computed for an element and the appearance
     // property has been set to a value other than "none".  The theme should map in all of the appropriate
     // metrics and defaults given the contents of the style.  This includes sophisticated operations like
@@ -313,6 +315,14 @@ protected:
     virtual bool paintMediaFullScreenVolumeSliderTrack(RenderObject*, const PaintInfo&, const IntRect&) { return true; }
     virtual bool paintMediaFullScreenVolumeSliderThumb(RenderObject*, const PaintInfo&, const IntRect&) { return true; }
 
+    virtual bool shouldUseFallbackTheme(RenderStyle*) const;
+    void adjustStyleUsingFallbackTheme(StyleResolver*, RenderStyle*, Element*);
+    bool paintUsingFallbackTheme(RenderObject*, const PaintInfo&, const IntRect&);
+    void adjustCheckboxStyleUsingFallbackTheme(StyleResolver*, RenderStyle*, Element*) const;
+    bool paintCheckboxUsingFallbackTheme(RenderObject*, const PaintInfo&, const IntRect&);
+    void adjustRadioStyleUsingFallbackTheme(StyleResolver*, RenderStyle*, Element*) const;
+    bool paintRadioUsingFallbackTheme(RenderObject*, const PaintInfo&, const IntRect&);
+
 public:
     // Methods for state querying
     ControlStates controlStatesForRenderer(const RenderObject* o) const;