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 7230ad3069dacaaf28c1cde37bfec09f092da698..41ad27e7251ca8c39b3fbfb475e517bf1b6bd7c2 100644
--- a/Source/core/rendering/compositing/CompositedLayerMapping.cpp
+++ b/Source/core/rendering/compositing/CompositedLayerMapping.cpp
@@ -1168,6 +1168,7 @@ void CompositedLayerMapping::updateDrawsContent()
             Color bgColor(Color::transparent);
             if (contentLayerSupportsDirectBackgroundComposition(renderer())) {
                 bgColor = rendererBackgroundColor();
+                hasPaintedContent = false;
             }
             contentLayer->setBackgroundColor(bgColor.rgb());
         }