Implement interfaces in PaintInfo and make it a class.

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 057b53f3168a95bf1b994ad57f9a46c9ee7ecd6a..e1e4df2d52e264afee6431cef9629be9483da53c 100644
--- a/Source/core/rendering/RenderTheme.h
+++ b/Source/core/rendering/RenderTheme.h
@@ -77,9 +77,9 @@ public:
     // This method is called to paint the widget as a background of the RenderObject.  A widget's foreground, e.g., the
     // text of a button, is always rendered by the engine itself.  The boolean return value indicates
     // whether the CSS border/background should also be painted.
-    bool paint(RenderObject*, const PaintInfo&, const IntRect&);
-    bool paintBorderOnly(RenderObject*, const PaintInfo&, const IntRect&);
-    bool paintDecorations(RenderObject*, const PaintInfo&, const IntRect&);
+    bool paint(RenderObject*, PaintInfo&, const IntRect&);
+    bool paintBorderOnly(RenderObject*, PaintInfo&, const IntRect&);
+    bool paintDecorations(RenderObject*, PaintInfo&, const IntRect&);
 
     // The remaining methods should be implemented by the platform-specific portion of the theme, e.g.,
     // RenderThemeMac.cpp for Mac OS X.
@@ -176,7 +176,7 @@ public:
     virtual ScrollbarControlSize scrollbarControlSizeForPart(ControlPart) { return RegularScrollbar; }
 
     // Method for painting the caps lock indicator
-    virtual bool paintCapsLockIndicator(RenderObject*, const PaintInfo&, const IntRect&) { return 0; };
+    virtual bool paintCapsLockIndicator(RenderObject*, PaintInfo&, const IntRect&) { return 0; };
 
     // Returns the repeat interval of the animation for the progress bar.
     virtual double animationRepeatIntervalForProgressBar(RenderProgress*) const;
@@ -204,7 +204,7 @@ public:
     virtual IntSize sliderTickSize() const = 0;
     // Returns the distance of slider tick origin from the slider track center.
     virtual int sliderTickOffsetFromTrackCenter() const = 0;
-    void paintSliderTicks(RenderObject*, const PaintInfo&, const IntRect&);
+    void paintSliderTicks(RenderObject*, PaintInfo&, const IntRect&);
 
     virtual bool shouldShowPlaceholderWhenFocused() const { return false; }
     virtual bool shouldHaveSpinButton(HTMLInputElement*) const;
@@ -267,14 +267,14 @@ protected:
     virtual bool paintMenuListButton(RenderObject*, const PaintInfo&, const IntRect&) { return true; }
 
     virtual void adjustMeterStyle(RenderStyle*, Element*) const;
-    virtual bool paintMeter(RenderObject*, const PaintInfo&, const IntRect&);
+    virtual bool paintMeter(RenderObject*, PaintInfo&, const IntRect&);
 
     virtual void adjustProgressBarStyle(RenderStyle*, Element*) const;
     virtual bool paintProgressBar(RenderObject*, const PaintInfo&, const IntRect&) { return true; }
 
 #if ENABLE(INPUT_SPEECH)
     virtual void adjustInputFieldSpeechButtonStyle(RenderStyle*, Element*) const;
-    virtual bool paintInputFieldSpeechButton(RenderObject*, const PaintInfo&, const IntRect&);
+    virtual bool paintInputFieldSpeechButton(RenderObject*, PaintInfo&, const IntRect&);
 #endif
 
     virtual void adjustSliderTrackStyle(RenderStyle*, Element*) const;
@@ -318,11 +318,11 @@ protected:
 
     virtual bool shouldUseFallbackTheme(RenderStyle*) const;
     void adjustStyleUsingFallbackTheme(RenderStyle*, Element*);
-    bool paintUsingFallbackTheme(RenderObject*, const PaintInfo&, const IntRect&);
+    bool paintUsingFallbackTheme(RenderObject*, PaintInfo&, const IntRect&);
     void adjustCheckboxStyleUsingFallbackTheme(RenderStyle*, Element*) const;
-    bool paintCheckboxUsingFallbackTheme(RenderObject*, const PaintInfo&, const IntRect&);
+    bool paintCheckboxUsingFallbackTheme(RenderObject*, PaintInfo&, const IntRect&);
     void adjustRadioStyleUsingFallbackTheme(RenderStyle*, Element*) const;
-    bool paintRadioUsingFallbackTheme(RenderObject*, const PaintInfo&, const IntRect&);
+    bool paintRadioUsingFallbackTheme(RenderObject*, PaintInfo&, const IntRect&);
 
 public:
     // Methods for state querying