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diff --git a/Source/WebKit2/UIProcess/mac/ChunkedUpdateDrawingAreaProxyMac.mm b/Source/WebKit2/UIProcess/mac/ChunkedUpdateDrawingAreaProxyMac.mm
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+++ b/Source/WebKit2/UIProcess/mac/ChunkedUpdateDrawingAreaProxyMac.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 "ChunkedUpdateDrawingAreaProxy.h"
+
+#include "DrawingAreaMessageKinds.h"
+#include "DrawingAreaProxyMessageKinds.h"
+#include "UpdateChunk.h"
+#include "WKAPICast.h"
+#include "WKView.h"
+#include "WebPageProxy.h"
+
+using namespace WebCore;
+
+namespace WebKit {
+
+WebPageProxy* ChunkedUpdateDrawingAreaProxy::page()
+{
+    return toImpl([m_webView pageRef]);
+}
+
+void ChunkedUpdateDrawingAreaProxy::ensureBackingStore()
+{
+    if (m_bitmapContext)
+        return;
+
+    RetainPtr<CGColorSpaceRef> colorSpace(AdoptCF, CGColorSpaceCreateDeviceRGB());
+    const IntSize& viewSize = size();
+    m_bitmapContext.adoptCF(CGBitmapContextCreate(0, viewSize.width(), viewSize.height(), 8, viewSize.width() * 4, colorSpace.get(), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host));
+    
+    // Flip the bitmap context coordinate system.
+    CGContextTranslateCTM(m_bitmapContext.get(), 0, viewSize.height());
+    CGContextScaleCTM(m_bitmapContext.get(), 1, -1);
+}
+
+void ChunkedUpdateDrawingAreaProxy::invalidateBackingStore()
+{
+    m_bitmapContext = 0;
+}
+
+bool ChunkedUpdateDrawingAreaProxy::platformPaint(const IntRect& rect, CGContextRef context)
+{
+    if (!m_bitmapContext)
+        return false;
+
+    CGContextSaveGState(context);
+
+    // Use the copy blend mode when drawing a background.
+    if (page()->drawsBackground())
+        CGContextSetBlendMode(context, kCGBlendModeCopy);
+
+    // Flip the destination.
+    CGContextScaleCTM(context, 1, -1);
+    CGContextTranslateCTM(context, 0, -m_size.height());
+
+    RetainPtr<CGImageRef> image(AdoptCF, CGBitmapContextCreateImage(m_bitmapContext.get()));
+    CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image.get()), CGImageGetHeight(image.get())), image.get());
+
+    CGContextRestoreGState(context);
+    return true;
+}
+
+void ChunkedUpdateDrawingAreaProxy::drawUpdateChunkIntoBackingStore(UpdateChunk* updateChunk)
+{
+    ensureBackingStore();
+
+    RetainPtr<CGImageRef> image(updateChunk->createImage());
+    IntRect updateChunkRect = updateChunk->rect();
+
+    CGContextSaveGState(m_bitmapContext.get());
+
+    // Use the copy blend mode to replace existing content.
+    CGContextSetBlendMode(m_bitmapContext.get(), kCGBlendModeCopy);
+
+    // Flip the destination.
+    CGContextScaleCTM(m_bitmapContext.get(), 1, -1);
+    CGContextTranslateCTM(m_bitmapContext.get(), 0, -(updateChunkRect.y() + updateChunkRect.bottom()));
+
+    CGContextDrawImage(m_bitmapContext.get(), updateChunkRect, image.get());
+
+    CGContextRestoreGState(m_bitmapContext.get());
+
+    [m_webView setNeedsDisplayInRect:NSRectFromCGRect(updateChunkRect)];
+}
+
+} // namespace WebKit