HTML Imports: No more BlockingDocumentCreation.

Source/core/html/imports/HTMLImport.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 26 matching lines @@
 namespace WebCore {
 
 HTMLImport* HTMLImport::root()
 {
     HTMLImport* i = this;
     while (i->parent())
         i = i->parent();
     return i;
 }
 
-void HTMLImport::appendChild(HTMLImport* child)
+bool HTMLImport::precedes(HTMLImport* import)
 {
-    TreeNode<HTMLImport>::appendChild(child);
+    for (HTMLImport* i = this; i; i = traverseNext(i)) {
+        if (i == import)
+            return true;
+    }
+
+    return false;
+}
+
+void HTMLImport::appendImport(HTMLImport* child)
+{
+    appendChild(child);
 
     // This prevents HTML parser from going beyond the
     // blockage line before the precise state is computed by recalcState().
     if (child->isSync())
         m_state = HTMLImportState::blockedState();
 
     stateWillChange();
 }
 
 void HTMLImport::stateDidChange()
@@ skipping 53 matching lines @@
         child->showTree(highlight, depth + 1);
 }
 
 void HTMLImport::showThis()
 {
     fprintf(stderr, "%p state=%d", this, m_state.peekValueForDebug());
 }
 #endif
 
 } // namespace WebCore