Optimize hasTagName when called on an HTMLElement / SVGElement

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 4e92ef10f2b87a184a981c15ef12dd3e53582623..79293e36501b7d5baaf24fd6319dc04c762d29d5 100644
--- a/Source/core/rendering/compositing/CompositedLayerMapping.cpp
+++ b/Source/core/rendering/compositing/CompositedLayerMapping.cpp
@@ -1696,7 +1696,7 @@ bool CompositedLayerMapping::containsPaintedContent() const
 
         // Now look at the body's renderer.
         HTMLElement* body = renderObject->document().body();
-        RenderObject* bodyObject = (body && body->hasLocalName(bodyTag)) ? body->renderer() : 0;
+        RenderObject* bodyObject = isHTMLBodyElement(body) ? body->renderer() : 0;
         if (bodyObject && hasBoxDecorationsOrBackgroundImage(bodyObject->style()))
             return true;
     }