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

ui/cc/TiledLayerChromium.h

Index: ui/cc/TiledLayerChromium.h
diff --git a/ui/cc/TiledLayerChromium.h b/ui/cc/TiledLayerChromium.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 TiledLayerChromium_h
+#define TiledLayerChromium_h
+
+#if USE(ACCELERATED_COMPOSITING)
+
+#include "LayerChromium.h"
+#include "LayerTextureUpdater.h"
+#include "cc/CCLayerTilingData.h"
+
+namespace WebCore {
+class UpdatableTile;
+
+class TiledLayerChromium : public LayerChromium {
+public:
+    enum TilingOption { AlwaysTile, NeverTile, AutoTile };
+
+    virtual ~TiledLayerChromium();
+
+    virtual void setIsMask(bool) OVERRIDE;
+
+    virtual void pushPropertiesTo(CCLayerImpl*) OVERRIDE;
+
+    virtual bool drawsContent() const OVERRIDE;
+    virtual bool needsContentsScale() const OVERRIDE;
+
+    virtual IntSize contentBounds() const OVERRIDE;
+
+    virtual void setNeedsDisplayRect(const FloatRect&) OVERRIDE;
+
+    virtual void setIsNonCompositedContent(bool) OVERRIDE;
+
+    virtual void setLayerTreeHost(CCLayerTreeHost*) OVERRIDE;
+
+    // Reserves all existing and valid tile textures to protect them from being
+    // recycled by the texture manager.
+    void protectTileTextures(const IntRect& layerRect);
+
+    virtual void reserveTextures() OVERRIDE;
+
+    virtual Region visibleContentOpaqueRegion() const OVERRIDE;
+
+protected:
+    TiledLayerChromium();
+
+    void updateTileSizeAndTilingOption();
+    void updateBounds();
+
+    // Exposed to subclasses for testing.
+    void setTileSize(const IntSize&);
+    void setTextureFormat(GC3Denum textureFormat) { m_textureFormat = textureFormat; }
+    void setBorderTexelOption(CCLayerTilingData::BorderTexelOption);
+    void setSampledTexelFormat(LayerTextureUpdater::SampledTexelFormat sampledTexelFormat) { m_sampledTexelFormat = sampledTexelFormat; }
+    size_t numPaintedTiles() { return m_tiler->tiles().size(); }
+
+    virtual LayerTextureUpdater* textureUpdater() const = 0;
+    virtual void createTextureUpdaterIfNeeded() = 0;
+
+    // Set invalidations to be potentially repainted during update().
+    void invalidateRect(const IntRect& layerRect);
+
+    // Reset state on tiles that will be used for updating the layer.
+    void resetUpdateState();
+
+    // Prepare data needed to update textures that intersect with layerRect.
+    void updateLayerRect(CCTextureUpdater&, const IntRect& layerRect, const CCOcclusionTracker*);
+
+    // Same as above, but this will try to paint additional surrounding content if idle.
+    void idleUpdateLayerRect(CCTextureUpdater&, const IntRect& layerRect, const CCOcclusionTracker*);
+
+    // After preparing an update, returns true if more pre-painting is needed.
+    bool needsIdlePaint(const IntRect& layerRect);
+
+    IntRect idlePaintRect(const IntRect& visibleLayerRect);
+
+    bool skipsDraw() const { return m_skipsDraw; }
+
+    // Virtual for testing
+    virtual TextureManager* textureManager() const;
+
+private:
+    virtual PassOwnPtr<CCLayerImpl> createCCLayerImpl() OVERRIDE;
+
+    void createTilerIfNeeded();
+    void setTilingOption(TilingOption);
+
+    bool tileOnlyNeedsPartialUpdate(UpdatableTile*);
+    bool tileNeedsBufferedUpdate(UpdatableTile*);
+
+    void updateTiles(bool idle, int left, int top, int right, int bottom, CCTextureUpdater&, const CCOcclusionTracker*);
+
+    UpdatableTile* tileAt(int, int) const;
+    UpdatableTile* createTile(int, int);
+
+    GC3Denum m_textureFormat;
+    bool m_skipsDraw;
+    bool m_skipsIdlePaint;
+    LayerTextureUpdater::SampledTexelFormat m_sampledTexelFormat;
+
+    // Tracks if we've done any painting on this update cycle.
+    bool m_didPaint;
+
+    TilingOption m_tilingOption;
+    OwnPtr<CCLayerTilingData> m_tiler;
+};
+
+}
+#endif // USE(ACCELERATED_COMPOSITING)
+
+#endif