Extract tree root responsibility out of HTMLImportsController.

Source/core/html/imports/HTMLImportsController.h

 /*
  * 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 30 matching lines @@
 #include "wtf/Vector.h"
 
 namespace WebCore {
 
 class FetchRequest;
 class ExecutionContext;
 class ResourceFetcher;
 class HTMLImportChild;
 class HTMLImportChildClient;
 class HTMLImportLoader;
+class HTMLImportTreeRoot;
 
-class HTMLImportsController FINAL : public NoBaseWillBeGarbageCollectedFinalized<HTMLImportsController>, public HTMLImport, public DocumentSupplement {
+class HTMLImportsController FINAL : public NoBaseWillBeGarbageCollectedFinalized<HTMLImportsController>, public DocumentSupplement {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(HTMLImportsController);
     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
 public:
     static void provideTo(Document&);
 
     explicit HTMLImportsController(Document&);
     virtual ~HTMLImportsController();
 
+    HTMLImportTreeRoot* root() const { return m_root.get(); }
+
     bool isMaster(const Document& document) const { return m_master == &document; }
     bool shouldBlockScriptExecution(const Document&) const;
     void wasDetachedFrom(const Document&);
 
-    // HTMLImport
-    virtual Document* document() const OVERRIDE;
-    virtual bool isDone() const OVERRIDE;
-    virtual void stateWillChange() OVERRIDE;
-    virtual void stateDidChange() OVERRIDE;
-
     HTMLImportChild* load(HTMLImport* parent, HTMLImportChildClient*, FetchRequest);
     void showSecurityErrorMessage(const String&);
 
     SecurityOrigin* securityOrigin() const;
     ResourceFetcher* fetcher() const;
     LocalFrame* frame() const;
     Document* master() const { return m_master; }
 
-    void recalcTimerFired(Timer<HTMLImportsController>*);
 
     HTMLImportLoader* createLoader();
 
     size_t loaderCount() const { return m_loaders.size(); }
     HTMLImportLoader* loaderAt(size_t i) const { return m_loaders[i].get(); }
     HTMLImportLoader* loaderFor(const Document&) const;
 
-    void scheduleRecalcState();
     HTMLImportChild* findLinkFor(const KURL&) const;
 
 private:
     HTMLImportChild* createChild(const KURL&, HTMLImportLoader*, HTMLImport* parent, HTMLImportChildClient*);
     void clear();
 
     Document* m_master;
-    Timer<HTMLImportsController> m_recalcTimer;
+
+    OwnPtr<HTMLImportTreeRoot> m_root;
 
     // List of import which has been loaded or being loaded.
     typedef Vector<OwnPtr<HTMLImportChild> > ImportList;
     ImportList m_imports;
 
     typedef Vector<RefPtr<HTMLImportLoader> > LoaderList;
     LoaderList m_loaders;
 };
 
-DEFINE_TYPE_CASTS(HTMLImportsController, HTMLImport, import, import->isRoot(), import.isRoot());
-
 } // namespace WebCore
 
 #endif // HTMLImportsController_h