Merge 181302 "Tell synthetic attribute nodes inside shadow DOM a..."

Source/core/dom/TreeScopeAdopter.cpp

Index: Source/core/dom/TreeScopeAdopter.cpp
===================================================================
--- Source/core/dom/TreeScopeAdopter.cpp	(revision 182749)
+++ Source/core/dom/TreeScopeAdopter.cpp	(working copy)
@@ -92,6 +92,13 @@
     ASSERT(oldDocument != newDocument);
     for (Node* node = &root; node; node = NodeTraversal::next(*node, &root)) {
         moveNodeToNewDocument(*node, oldDocument, newDocument);
+
+        if (node->hasSyntheticAttrChildNodes()) {
+            WillBeHeapVector<RefPtrWillBeMember<Attr> >& attrs = *toElement(node)->attrNodeList();
+            for (unsigned i = 0; i < attrs.size(); ++i)
+                moveTreeToNewDocument(*attrs[i], oldDocument, newDocument);
+        }
+
         for (ShadowRoot* shadow = node->youngestShadowRoot(); shadow; shadow = shadow->olderShadowRoot())
             moveTreeToNewDocument(*shadow, oldDocument, newDocument);
     }