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diff --git a/WebCore/loader/ResourceLoadScheduler.h b/WebCore/loader/ResourceLoadScheduler.h
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+/*
+    Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
+    Copyright (C) 2001 Dirk Mueller <mueller@kde.org>
+    Copyright (C) 2004, 2006, 2007, 2008 Apple Inc. All rights reserved.
+    Copyright (C) 2010 Google Inc. All rights reserved.
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+ */
+
+#ifndef ResourceLoadScheduler_h
+#define ResourceLoadScheduler_h
+
+#include "FrameLoaderTypes.h"
+#include "PlatformString.h"
+#include "Timer.h"
+#include <wtf/Deque.h>
+#include <wtf/HashMap.h>
+#include <wtf/HashSet.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/text/StringHash.h>
+
+namespace WebCore {
+
+class Frame;
+class KURL;
+class NetscapePlugInStreamLoader;
+class NetscapePlugInStreamLoaderClient;
+class ResourceLoader;
+class ResourceRequest;
+class SubresourceLoader;
+class SubresourceLoaderClient;
+
+class ResourceLoadScheduler : public Noncopyable {
+public:
+    friend ResourceLoadScheduler* resourceLoadScheduler();
+
+    enum Priority { VeryLow, Low, Medium, High, LowestPriority = VeryLow, HighestPriority = High };
+    PassRefPtr<SubresourceLoader> scheduleSubresourceLoad(Frame*, SubresourceLoaderClient*, const ResourceRequest&, Priority = Low, SecurityCheckPolicy = DoSecurityCheck, bool sendResourceLoadCallbacks = true, bool shouldContentSniff = true);
+    PassRefPtr<NetscapePlugInStreamLoader> schedulePluginStreamLoad(Frame*, NetscapePlugInStreamLoaderClient*, const ResourceRequest&);
+    void addMainResourceLoad(ResourceLoader*);
+    void remove(ResourceLoader*);
+    void crossOriginRedirectReceived(ResourceLoader*, const KURL& redirectURL);
+    
+    void servePendingRequests(Priority minimumPriority = VeryLow);
+    void suspendPendingRequests();
+    void resumePendingRequests();
+
+private:
+    ResourceLoadScheduler();
+    ~ResourceLoadScheduler();
+
+    void scheduleLoad(ResourceLoader*, Priority);
+    void scheduleServePendingRequests();
+    void requestTimerFired(Timer<ResourceLoadScheduler>*);
+
+    class HostInformation : public Noncopyable {
+    public:
+        HostInformation(const String&, unsigned);
+        ~HostInformation();
+        
+        const String& name() const { return m_name; }
+        void schedule(ResourceLoader*, Priority = VeryLow);
+        void addLoadInProgress(ResourceLoader*);
+        void remove(ResourceLoader*);
+        bool hasRequests() const;
+        bool limitRequests() const { return m_requestsLoading.size() >= m_maxRequestsInFlight; }
+
+        typedef Deque<RefPtr<ResourceLoader> > RequestQueue;
+        RequestQueue& requestsPending(Priority priority) { return m_requestsPending[priority]; }
+
+    private:                    
+        RequestQueue m_requestsPending[HighestPriority + 1];
+        typedef HashSet<RefPtr<ResourceLoader> > RequestMap;
+        RequestMap m_requestsLoading;
+        const String m_name;
+        const int m_maxRequestsInFlight;
+    };
+
+    enum CreateHostPolicy {
+        CreateIfNotFound,
+        FindOnly
+    };
+    
+    HostInformation* hostForURL(const KURL&, CreateHostPolicy = FindOnly);
+    void servePendingRequests(HostInformation*, Priority);
+
+    typedef HashMap<String, HostInformation*, StringHash> HostMap;
+    HostMap m_hosts;
+    HostInformation* m_nonHTTPProtocolHost;
+        
+    Timer<ResourceLoadScheduler> m_requestTimer;
+
+    bool m_isSuspendingPendingRequests;
+};
+
+ResourceLoadScheduler* resourceLoadScheduler();
+
+}
+
+#endif