Implement interfaces in PaintInfo and make it a class.

Source/core/rendering/RenderView.cpp

Index: Source/core/rendering/RenderView.cpp
diff --git a/Source/core/rendering/RenderView.cpp b/Source/core/rendering/RenderView.cpp
index 8bfcbf2d2c5c81ac7e6c7a0899dd8f772cfb52ab..cfd75e909e65c87d8a9778d2ce424565f66aa897 100644
--- a/Source/core/rendering/RenderView.cpp
+++ b/Source/core/rendering/RenderView.cpp
@@ -408,7 +408,7 @@ void RenderView::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 
     // This avoids painting garbage between columns if there is a column gap.
     if (m_frameView && m_frameView->pagination().mode != Pagination::Unpaginated)
-        paintInfo.context->fillRect(paintInfo.rect, m_frameView->baseBackgroundColor());
+        paintInfo.getContext()->fillRect(paintInfo.getRect(), m_frameView->baseBackgroundColor());
 
     paintObject(paintInfo, paintOffset);
 }
@@ -492,12 +492,13 @@ void RenderView::paintBoxDecorations(PaintInfo& paintInfo, const LayoutPoint&)
     else {
         Color baseColor = frameView()->baseBackgroundColor();
         if (baseColor.alpha()) {
-            CompositeOperator previousOperator = paintInfo.context->compositeOperation();
-            paintInfo.context->setCompositeOperation(CompositeCopy);
-            paintInfo.context->fillRect(paintInfo.rect, baseColor);
-            paintInfo.context->setCompositeOperation(previousOperator);
-        } else
-            paintInfo.context->clearRect(paintInfo.rect);
+            CompositeOperator previousOperator = paintInfo.getContext()->compositeOperation();
+            paintInfo.getContext()->setCompositeOperation(CompositeCopy);
+            paintInfo.getContext()->fillRect(paintInfo.getRect(), baseColor);
+            paintInfo.getContext()->setCompositeOperation(previousOperator);
+        } else {
+            paintInfo.getContext()->clearRect(paintInfo.getRect());
+        }
     }
 }