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

ui/cc/LayerTextureUpdater.h

Index: ui/cc/LayerTextureUpdater.h
diff --git a/ui/cc/LayerTextureUpdater.h b/ui/cc/LayerTextureUpdater.h
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+++ b/ui/cc/LayerTextureUpdater.h
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+/*
+ * Copyright (C) 2011 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 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 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 LayerTextureUpdater_h
+#define LayerTextureUpdater_h
+
+#if USE(ACCELERATED_COMPOSITING)
+
+#include "ManagedTexture.h"
+#include "GraphicsTypes3D.h"
+#include <wtf/RefCounted.h>
+
+namespace WebCore {
+
+class CCGraphicsContext;
+class IntRect;
+class IntSize;
+class TextureAllocator;
+class TextureManager;
+
+class LayerTextureUpdater : public RefCounted<LayerTextureUpdater> {
+public:
+    // Allows texture uploaders to store per-tile resources.
+    class Texture {
+    public:
+        virtual ~Texture() { }
+
+        ManagedTexture* texture() { return m_texture.get(); }
+        virtual void prepareRect(const IntRect& /* sourceRect */) { }
+        virtual void updateRect(CCGraphicsContext*, TextureAllocator*, const IntRect& sourceRect, const IntRect& destRect) = 0;
+    protected:
+        explicit Texture(PassOwnPtr<ManagedTexture> texture) : m_texture(texture) { }
+
+    private:
+        OwnPtr<ManagedTexture> m_texture;
+    };
+
+    virtual ~LayerTextureUpdater() { }
+
+    enum SampledTexelFormat {
+        SampledTexelFormatRGBA,
+        SampledTexelFormatBGRA,
+        SampledTexelFormatInvalid,
+    };
+    virtual PassOwnPtr<Texture> createTexture(TextureManager*) = 0;
+    // Returns the format of the texel uploaded by this interface.
+    // This format should not be confused by texture internal format.
+    // This format specifies the component order in the sampled texel.
+    // If the format is TexelFormatBGRA, vec4.x is blue and vec4.z is red.
+    virtual SampledTexelFormat sampledTexelFormat(GC3Denum textureFormat) = 0;
+    // The |resultingOpaqueRect| gives back a region of the layer that was painted opaque. If the layer is marked opaque in the updater,
+    // then this region should be ignored in preference for the entire layer's area.
+    virtual void prepareToUpdate(const IntRect& contentRect, const IntSize& tileSize, float contentsScale, IntRect& resultingOpaqueRect) { }
+
+    // Set true by the layer when it is known that the entire output is going to be opaque.
+    virtual void setOpaque(bool) { }
+};
+
+} // namespace WebCore
+#endif // USE(ACCELERATED_COMPOSITING)
+#endif // LayerTextureUpdater_h