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diff --git a/Source/WebKit2/UIProcess/mac/LayerBackedDrawingAreaProxyMac.mm b/Source/WebKit2/UIProcess/mac/LayerBackedDrawingAreaProxyMac.mm
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+/*
+ * Copyright (C) 2010 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. 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.
+ */
+
+#include "LayerBackedDrawingAreaProxy.h"
+
+#include "DrawingAreaMessageKinds.h"
+#include "DrawingAreaProxyMessageKinds.h"
+#include <QuartzCore/QuartzCore.h>
+#include "WKAPICast.h"
+#include "WKView.h"
+#include "WKViewInternal.h"
+#include "WebKitSystemInterface.h"
+#include "WebPageProxy.h"
+
+using namespace WebCore;
+
+namespace WebKit {
+
+WebPageProxy* LayerBackedDrawingAreaProxy::page()
+{
+    return toImpl([m_webView pageRef]);
+}
+
+void LayerBackedDrawingAreaProxy::platformSetSize()
+{
+    [m_compositingRootLayer.get() setBounds:CGRectMake(0, 0, size().width(), size().height())];
+}
+
+void LayerBackedDrawingAreaProxy::attachCompositingContext(uint32_t contextID)
+{
+#if HAVE(HOSTED_CORE_ANIMATION)
+    m_compositingRootLayer = WKMakeRenderLayer(contextID);
+
+    // Turn off default animations.
+    NSNull *nullValue = [NSNull null];
+    NSDictionary *actions = [NSDictionary dictionaryWithObjectsAndKeys:
+                             nullValue, @"anchorPoint",
+                             nullValue, @"bounds",
+                             nullValue, @"contents",
+                             nullValue, @"contentsRect",
+                             nullValue, @"opacity",
+                             nullValue, @"position",
+                             nullValue, @"sublayerTransform",
+                             nullValue, @"sublayers",
+                             nullValue, @"transform",
+                             nil];
+    [m_compositingRootLayer.get() setStyle:[NSDictionary dictionaryWithObject:actions forKey:@"actions"]];
+    
+    [m_compositingRootLayer.get() setAnchorPoint:CGPointZero];
+    [m_compositingRootLayer.get() setBounds:CGRectMake(0, 0, size().width(), size().height())];
+    
+    // FIXME: this fixes the layer jiggle when resizing the window, but breaks layer flipping because
+    // CA doesn't propagate the kCALayerFlagFlippedAbove through the remote layer.
+    // [m_compositingRootLayer.get() setGeometryFlipped:YES];
+
+#ifndef NDEBUG
+    [m_compositingRootLayer.get() setName:@"Compositing root layer"];
+#endif
+
+    [m_webView _startAcceleratedCompositing:m_compositingRootLayer.get()];
+#endif
+}
+
+void LayerBackedDrawingAreaProxy::detachCompositingContext()
+{
+    [m_webView _stopAcceleratedCompositing];
+    m_compositingRootLayer = 0;
+}
+
+} // namespace WebKit