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diff --git a/Source/WebCore/platform/graphics/ca/win/LegacyCACFLayerTreeHost.h b/Source/WebCore/platform/graphics/ca/win/LegacyCACFLayerTreeHost.h
new file mode 100644
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+++ b/Source/WebCore/platform/graphics/ca/win/LegacyCACFLayerTreeHost.h
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2011 Apple 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. ``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 COMPUTER, INC. OR
+ * 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 LegacyCACFLayerTreeHost_h
+#define LegacyCACFLayerTreeHost_h
+
+#if USE(ACCELERATED_COMPOSITING)
+
+#include "CACFLayerTreeHost.h"
+
+namespace WebCore {
+
+// FIXME: Currently there is a LegacyCACFLayerTreeHost for each WebView and each
+// has its own WKCACFContext and Direct3DDevice9, which is inefficient.
+// (https://bugs.webkit.org/show_bug.cgi?id=31855)
+class LegacyCACFLayerTreeHost : public CACFLayerTreeHost {
+public:
+    static PassRefPtr<LegacyCACFLayerTreeHost> create();
+    virtual ~LegacyCACFLayerTreeHost();
+
+private:
+    LegacyCACFLayerTreeHost();
+
+    void initD3DGeometry();
+
+    // Call this when the device window has changed size or when IDirect3DDevice9::Present returns
+    // D3DERR_DEVICELOST. Returns true if the device was recovered, false if rendering must be
+    // aborted and reattempted soon.
+    enum ResetReason { ChangedWindowSize, LostDevice };
+    bool resetDevice(ResetReason);
+
+    void renderSoon();
+    void renderTimerFired(Timer<LegacyCACFLayerTreeHost>*);
+
+    virtual void initializeContext(void* userData, PlatformCALayer*);
+    virtual void resize();
+    virtual bool createRenderer();
+    virtual void destroyRenderer();
+    virtual CFTimeInterval lastCommitTime() const;
+    virtual void flushContext();
+    virtual void contextDidChange();
+    virtual void paint();
+    virtual void render(const Vector<CGRect>& dirtyRects = Vector<CGRect>());
+
+    Timer<LegacyCACFLayerTreeHost> m_renderTimer;
+    COMPtr<IDirect3DDevice9> m_d3dDevice;
+    WKCACFContext* m_context;
+    bool m_mightBeAbleToCreateDeviceLater;
+    bool m_mustResetLostDeviceBeforeRendering;
+
+#ifndef NDEBUG
+    bool m_printTree;
+#endif
+};
+
+} // namespace WebCore
+
+#endif // USE(ACCELERATED_COMPOSITING)
+
+#endif // LegacyCACFLayerTreeHost_h