[HTML Imports] Make import loading in order.

Source/core/html/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 18 matching lines @@
  */
 
 #ifndef HTMLImportsController_h
 #define HTMLImportsController_h
 
 #include "core/html/HTMLImport.h"
 #include "core/html/LinkResource.h"
 #include "core/loader/cache/CachedRawResource.h"
 #include "core/loader/cache/ResourcePtr.h"
 #include "core/platform/Supplementable.h"
+#include "core/platform/Timer.h"
 #include "wtf/FastAllocBase.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/Vector.h"
 
 namespace WebCore {
 
 class ScriptExecutionContext;
 class ResourceFetcher;
 class HTMLImportLoader;
 class HTMLImportsController;
@@ skipping 35 matching lines @@
     virtual ~HTMLImportLoader();
 
     Document* importedDocument() const;
     const KURL& url() const { return m_url; }
 
     void importDestroyed();
     bool isDone() const { return m_state == StateReady || m_state == StateError; }
 
     // HTMLImport
     virtual HTMLImportsController* controller() OVERRIDE;
-    virtual HTMLImport* parent() OVERRIDE;
-    virtual Document* document() OVERRIDE;
+    virtual HTMLImport* parent() const OVERRIDE;
+    virtual Document* document() const OVERRIDE;
     virtual void wasDetachedFromDocument() OVERRIDE;
     virtual void didFinishParsing() OVERRIDE;
+    virtual bool isProcessing() const OVERRIDE;
 
 private:
     HTMLImportLoader(HTMLImport*, const KURL&, const ResourcePtr<CachedScript>&);
 
     // CachedRawResourceClient
     virtual void responseReceived(Resource*, const ResourceResponse&) OVERRIDE;
     virtual void dataReceived(Resource*, const char* data, int length) OVERRIDE;
     virtual void notifyFinished(Resource*) OVERRIDE;
 
     State startWritingAndParsing(const ResourceResponse&);
@@ skipping 14 matching lines @@
 class HTMLImportsController : public HTMLImport, public Supplement<ScriptExecutionContext> {
     WTF_MAKE_FAST_ALLOCATED;
 public:
     static void provideTo(Document*);
 
     explicit HTMLImportsController(Document*);
     virtual ~HTMLImportsController();
 
     // HTMLImport
     virtual HTMLImportsController* controller() OVERRIDE;
-    virtual HTMLImport* parent() OVERRIDE;
-    virtual Document* document() OVERRIDE;
+    virtual HTMLImport* parent() const OVERRIDE;
+    virtual Document* document() const OVERRIDE;
     virtual void wasDetachedFromDocument() OVERRIDE;
     virtual void didFinishParsing() OVERRIDE;
+    virtual bool isProcessing() const OVERRIDE;
 
     void addImport(PassRefPtr<HTMLImportLoader>);
     void showSecurityErrorMessage(const String&);
     PassRefPtr<HTMLImportLoader> findLinkFor(const KURL&) const;
     SecurityOrigin* securityOrigin() const;
     ResourceFetcher* fetcher() const;
-    bool haveChildrenLoaded(HTMLImport* parent) const;
-    void didLoad(HTMLImportLoader*);
+
+    void scheduleUnblock();
+    void unblockTimerFired(Timer<HTMLImportsController>*);
 
 private:
     void clear();
 
     Document* m_master;
+    Timer<HTMLImportsController> m_unblockTimer;
 
     // List of import which has been loaded or being loaded.
     typedef Vector<RefPtr<HTMLImportLoader> > ImportList;
     ImportList m_imports;
 };
 
 } // namespace WebCore
 
 #endif // HTMLImportsController_h