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

Source/core/loader/cache/FetchRequest.h

 /*
  * Copyright (C) 2012 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 29 matching lines @@
 public:
     enum DeferOption { NoDefer, DeferredByClient };
 
     explicit FetchRequest(const ResourceRequest&, const AtomicString& initiator, const String& charset = String(), ResourceLoadPriority = ResourceLoadPriorityUnresolved);
     FetchRequest(const ResourceRequest&, const AtomicString& initiator, const ResourceLoaderOptions&);
     FetchRequest(const ResourceRequest&, const FetchInitiatorInfo&);
     ~FetchRequest();
 
     ResourceRequest& mutableResourceRequest() { return m_resourceRequest; }
     const ResourceRequest& resourceRequest() const { return m_resourceRequest; }
+    const KURL& url() const { return m_resourceRequest.url(); }
     const String& charset() const { return m_charset; }
     void setCharset(const String& charset) { m_charset = charset; }
     const ResourceLoaderOptions& options() const { return m_options; }
     void setOptions(const ResourceLoaderOptions& options) { m_options = options; }
     ResourceLoadPriority priority() const { return m_priority; }
     bool forPreload() const { return m_forPreload; }
     void setForPreload(bool forPreload) { m_forPreload = forPreload; }
     DeferOption defer() const { return m_defer; }
     void setDefer(DeferOption defer) { m_defer = defer; }
     void setContentSecurityCheck(ContentSecurityPolicyCheck contentSecurityPolicyOption) { m_options.contentSecurityPolicyOption = contentSecurityPolicyOption; }
     void setPotentiallyCrossOriginEnabled(SecurityOrigin*, StoredCredentials);
 
 private:
     ResourceRequest m_resourceRequest;
     String m_charset;
     ResourceLoaderOptions m_options;
     ResourceLoadPriority m_priority;
     bool m_forPreload;
     DeferOption m_defer;
 };
 
 } // namespace WebCore
 
 #endif