Initial import attempt, just to play with. Many things disabled/removed

ui/cc/ThrottledTextureUploader.h

Index: ui/cc/ThrottledTextureUploader.h
diff --git a/ui/cc/ThrottledTextureUploader.h b/ui/cc/ThrottledTextureUploader.h
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+/*
+ * 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
+ *     documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef ThrottledTextureUploader_h
+#define ThrottledTextureUploader_h
+
+#include "TextureUploader.h"
+
+#include <wtf/Deque.h>
+
+namespace WebKit {
+class WebGraphicsContext3D;
+}
+
+namespace WebCore {
+
+class ThrottledTextureUploader : public TextureUploader {
+    WTF_MAKE_NONCOPYABLE(ThrottledTextureUploader);
+public:
+    static PassOwnPtr<ThrottledTextureUploader> create(WebKit::WebGraphicsContext3D* context)
+    {
+        return adoptPtr(new ThrottledTextureUploader(context));
+    }
+    static PassOwnPtr<ThrottledTextureUploader> create(WebKit::WebGraphicsContext3D* context, size_t pendingUploadLimit)
+    {
+        return adoptPtr(new ThrottledTextureUploader(context, pendingUploadLimit));
+    }
+    virtual ~ThrottledTextureUploader();
+
+    virtual bool isBusy() OVERRIDE;
+    virtual void beginUploads() OVERRIDE;
+    virtual void endUploads() OVERRIDE;
+    virtual void uploadTexture(CCGraphicsContext*, LayerTextureUpdater::Texture*, TextureAllocator*, const IntRect sourceRect, const IntRect destRect) OVERRIDE;
+
+private:
+    class Query {
+    public:
+        static PassOwnPtr<Query> create(WebKit::WebGraphicsContext3D* context) { return adoptPtr(new Query(context)); }
+
+        virtual ~Query();
+
+        void begin();
+        void end();
+        bool isPending();
+        void wait();
+
+    private:
+        explicit Query(WebKit::WebGraphicsContext3D*);
+
+        WebKit::WebGraphicsContext3D* m_context;
+        unsigned m_queryId;
+    };
+
+    ThrottledTextureUploader(WebKit::WebGraphicsContext3D*);
+    ThrottledTextureUploader(WebKit::WebGraphicsContext3D*, size_t pendingUploadLimit);
+
+    void processQueries();
+
+    WebKit::WebGraphicsContext3D* m_context;
+    size_t m_maxPendingQueries;
+    Deque<OwnPtr<Query> > m_pendingQueries;
+    Deque<OwnPtr<Query> > m_availableQueries;
+};
+
+}
+
+#endif