Partial revert of r178392

Source/core/rendering/compositing/CompositedLayerMapping.cpp

Index: Source/core/rendering/compositing/CompositedLayerMapping.cpp
diff --git a/Source/core/rendering/compositing/CompositedLayerMapping.cpp b/Source/core/rendering/compositing/CompositedLayerMapping.cpp
index 2bee39b3bbe77d163122873f20ebb097d53a526e..fbb7676a1e3ab3e656d5bac214592d6b768933a1 100644
--- a/Source/core/rendering/compositing/CompositedLayerMapping.cpp
+++ b/Source/core/rendering/compositing/CompositedLayerMapping.cpp
@@ -1110,6 +1110,7 @@ void CompositedLayerMapping::updateDrawsContent()
             Color bgColor(Color::transparent);
             if (contentLayerSupportsDirectBackgroundComposition(renderer())) {
                 bgColor = rendererBackgroundColor();
+                hasPaintedContent = false;
             }
             contentLayer->setBackgroundColor(bgColor.rgb());
         }