Invalidate the frame view when changing the background image of the document or body.

Source/core/rendering/RenderBox.cpp

Index: Source/core/rendering/RenderBox.cpp
diff --git a/Source/core/rendering/RenderBox.cpp b/Source/core/rendering/RenderBox.cpp
index 4e9c5502a314135d5ee455718ca4785abf23e63f..8f3be9c4f09dbf1868cb6405e74ca0a9f82c3f45 100644
--- a/Source/core/rendering/RenderBox.cpp
+++ b/Source/core/rendering/RenderBox.cpp
@@ -1283,6 +1283,8 @@ bool RenderBox::paintInvalidationLayerRectsForImage(WrappedImagePtr image, const
     if (drawingBackground && (isDocumentElement() || (isBody() && !document().documentElement()->renderer()->hasBackground()))) {
         layerRenderers.append(document().documentElement()->renderer());
         layerRenderers.append(view());
+        if (view()->frameView())
+            view()->frameView()->setNeedsFullPaintInvalidation();

[dsinclair, 2014/10/31 00:14:34]

What about doing view()->setShouldDoFullPaintInvalidation() which should force
the render view to fully invalidate? Then you don't need to add
setNeedsFullPaintInvalidation on frameView.

[Xianzhu, 2014/10/31 16:37:30]

Would view()->setNeedsFullPaintInvalidation() work?

     } else {
         layerRenderers.append(this);
     }