Implement interfaces in PaintInfo and make it a class.

Source/core/rendering/RenderObject.cpp

Index: Source/core/rendering/RenderObject.cpp
diff --git a/Source/core/rendering/RenderObject.cpp b/Source/core/rendering/RenderObject.cpp
index 376a739140520cab245ee520d644e3c46b0efdc8..5be6a860cee2f7ff00f0339fdaa8c9f5294b72dc 100644
--- a/Source/core/rendering/RenderObject.cpp
+++ b/Source/core/rendering/RenderObject.cpp
@@ -1112,11 +1112,11 @@ void RenderObject::drawLineForBoxSide(GraphicsContext* graphicsContext, int x1,
 void RenderObject::paintFocusRing(PaintInfo& paintInfo, const LayoutPoint& paintOffset, RenderStyle* style)
 {
     Vector<IntRect> focusRingRects;
-    addFocusRingRects(focusRingRects, paintOffset, paintInfo.paintContainer);
+    addFocusRingRects(focusRingRects, paintOffset, paintInfo.getPaintContainer());
     if (style->outlineStyleIsAuto())
-        paintInfo.context->drawFocusRing(focusRingRects, style->outlineWidth(), style->outlineOffset(), resolveColor(style, CSSPropertyOutlineColor));
+        paintInfo.getContext()->drawFocusRing(focusRingRects, style->outlineWidth(), style->outlineOffset(), resolveColor(style, CSSPropertyOutlineColor));
     else
-        addPDFURLRect(paintInfo.context, unionRect(focusRingRects));
+        addPDFURLRect(paintInfo.getContext(), unionRect(focusRingRects));
 }
 
 void RenderObject::addPDFURLRect(GraphicsContext* context, const LayoutRect& rect)
@@ -1174,7 +1174,7 @@ void RenderObject::paintOutline(PaintInfo& paintInfo, const LayoutRect& paintRec
     EBorderStyle outlineStyle = styleToUse->outlineStyle();
     Color outlineColor = resolveColor(styleToUse, CSSPropertyOutlineColor);
 
-    GraphicsContext* graphicsContext = paintInfo.context;
+    GraphicsContext* graphicsContext = paintInfo.getContext();
     bool useTransparencyLayer = outlineColor.hasAlpha();
     if (useTransparencyLayer) {
         if (outlineStyle == SOLID) {