[HTML Imports] Implement "load" and "error" events.

Source/core/html/HTMLImportLoader.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 23 matching lines @@
 #include "core/html/HTMLImport.h"
 #include "core/loader/cache/CachedRawResource.h"
 #include "core/loader/cache/ResourcePtr.h"
 #include "weborigin/KURL.h"
 #include "wtf/RefCounted.h"
 #include "wtf/Vector.h"
 
 namespace WebCore {
 
 class DocumentWriter;
+class HTMLImportLoaderClient;
 
 class HTMLImportLoader : public RefCounted<HTMLImportLoader>, public HTMLImport, public CachedRawResourceClient {
 public:
     enum State {
         StateLoading,
         StateWritten,
         StateError,
         StateReady
     };
 
     HTMLImportLoader(HTMLImport*, const KURL&, const ResourcePtr<CachedRawResource>&);
     virtual ~HTMLImportLoader();
 
     Document* importedDocument() const;
     const KURL& url() const { return m_url; }
 
+    void addClient(HTMLImportLoaderClient*);
+    void removeClient(HTMLImportLoaderClient*);
     void importDestroyed();
     bool isDone() const { return m_state == StateReady || m_state == StateError; }
+    bool isLoaded() const { return m_state == StateReady; }
 
     // HTMLImport
     virtual HTMLImportRoot* root() 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:
 
     // 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&);
     State finishWriting();
     State finishParsing();
 
     void setState(State);
-    void dispose();
+    void didFinish();
 
     HTMLImport* m_parent;
+    Vector<HTMLImportLoaderClient*> m_clients;
     State m_state;
     KURL m_url;
     ResourcePtr<CachedRawResource> m_resource;
     RefPtr<Document> m_importedDocument;
     RefPtr<DocumentWriter> m_writer;
 };
 
 } // namespace WebCore
 
 #endif // HTMLImportLoader_h