[Refactring] Turn HTMLImport::m_sync from bool to an enum.

Source/core/html/imports/HTMLImport.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 83 matching lines @@
 //
 // - An import under loading also blocks imported documents that follow from being created.
 //   This is because an import can include another import that has same URLs of following ones.
 //   In such case, the preceding import should be loaded and following ones should be de-duped.
 //
 
 // The superclass of HTMLImportsController and HTMLImportChild
 // This represents the import tree data structure.
 class HTMLImport : public TreeNode<HTMLImport> {
 public:
+    enum SyncMode {
+        Sync  = 0,
+        Async = 1
+    };
+
     static bool isMaster(Document*);
 
     virtual ~HTMLImport() { }
 
     LocalFrame* frame();
     Document* master();
     HTMLImportsController* controller();
     bool isRoot() const { return !isChild(); }
-    bool isSync() const { return m_sync; }
+    bool isSync() const { return SyncMode(m_sync) == Sync; }
     const HTMLImportState& state() const { return m_state; }
 
     void appendChild(HTMLImport*);
 
     virtual bool isChild() const { return false; }
     virtual HTMLImportRoot* root() = 0;
     virtual Document* document() const = 0;
     virtual void wasDetachedFromDocument() = 0;
     virtual void didFinishParsing() { };
     virtual void didRemoveAllPendingStylesheet() { }
     virtual bool isDone() const = 0; // FIXME: Should be renamed to haveFinishedLoading()
     virtual bool hasLoader() const = 0;
     virtual bool ownsLoader() const { return false; }
     virtual CustomElementMicrotaskImportStep* customElementMicrotaskStep() const { return 0; }
     virtual void stateDidChange();
 
 protected:
     // Stating from most conservative state.
     // It will be corrected through state update flow.
-    explicit HTMLImport(bool sync = false)
+    explicit HTMLImport(SyncMode sync)
         : m_sync(sync)
     { }
 
     void stateWillChange();
     static void recalcTreeState(HTMLImport* root);
 
 #if !defined(NDEBUG)
     void show();
     void showTree(HTMLImport* highlight, unsigned depth);
     virtual void showThis();
 #endif
 
 private:
     HTMLImportState m_state;
-    bool m_sync : 1;
+    unsigned m_sync : 1;
 };
 
 // An abstract class to decouple its sublcass HTMLImportsController.
 class HTMLImportRoot : public HTMLImport {
 public:
-    HTMLImportRoot() { }
+    HTMLImportRoot() : HTMLImport(Sync) { }
 
     virtual void scheduleRecalcState() = 0;
     virtual HTMLImportsController* toController() = 0;
     virtual HTMLImportChild* findLinkFor(const KURL&, HTMLImport* excluding = 0) const = 0;
 };
 
 } // namespace WebCore
 
 #endif // HTMLImport_h