Merge 87863

Source/WebCore/dom/Document.cpp

Index: Source/WebCore/dom/Document.cpp
===================================================================
--- Source/WebCore/dom/Document.cpp	(revision 88810)
+++ Source/WebCore/dom/Document.cpp	(working copy)
@@ -2031,11 +2031,21 @@
 
 void Document::setBody(PassRefPtr<HTMLElement> newBody, ExceptionCode& ec)
 {
-    if (!newBody || !documentElement()) { 
+    ec = 0;
+
+    if (!newBody || !documentElement() || !newBody->hasTagName(bodyTag)) { 
         ec = HIERARCHY_REQUEST_ERR;
         return;
     }
 
+    if (newBody->document() && newBody->document() != this) {
+        RefPtr<Node> node = importNode(newBody.get(), true, ec);
+        if (ec)
+            return;
+        
+        newBody = toHTMLElement(node.get());
+    }
+
     HTMLElement* b = body();
     if (!b)
         documentElement()->appendChild(newBody, ec);