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diff --git a/Source/WebKit2/WebProcess/WebPage/PageOverlay.cpp b/Source/WebKit2/WebProcess/WebPage/PageOverlay.cpp
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+++ b/Source/WebKit2/WebProcess/WebPage/PageOverlay.cpp
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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 "PageOverlay.h"
+
+#include "WebPage.h"
+#include <WebCore/Frame.h>
+#include <WebCore/FrameView.h>
+#include <WebCore/GraphicsContext.h>
+#include <WebCore/Page.h>
+
+using namespace WebCore;
+
+namespace WebKit {
+
+PassRefPtr<PageOverlay> PageOverlay::create(Client* client)
+{
+    return adoptRef(new PageOverlay(client));
+}
+
+PageOverlay::PageOverlay(Client* client)
+    : m_client(client)
+    , m_webPage(0)
+{
+}
+
+PageOverlay::~PageOverlay()
+{
+}
+
+IntRect PageOverlay::bounds() const
+{
+    FrameView* frameView = webPage()->corePage()->mainFrame()->view();
+
+    int width = frameView->width();
+    if (frameView->verticalScrollbar())
+        width -= frameView->verticalScrollbar()->width();
+    int height = frameView->height();
+    if (frameView->horizontalScrollbar())
+        height -= frameView->horizontalScrollbar()->height();
+    
+    return IntRect(0, 0, width, height);
+}
+
+void PageOverlay::setPage(WebPage* webPage)
+{
+    m_client->willMoveToWebPage(this, webPage);
+    m_webPage = webPage;
+    m_client->didMoveToWebPage(this, webPage);
+}
+
+void PageOverlay::setNeedsDisplay(const WebCore::IntRect& dirtyRect)
+{
+    if (m_webPage)
+        m_webPage->drawingArea()->setNeedsDisplay(dirtyRect);
+}
+
+void PageOverlay::setNeedsDisplay()
+{
+    setNeedsDisplay(bounds());
+}
+
+void PageOverlay::drawRect(GraphicsContext& graphicsContext, const IntRect& dirtyRect)
+{
+    // If the dirty rect is outside the bounds, ignore it.
+    IntRect paintRect = intersection(dirtyRect, bounds());
+    if (paintRect.isEmpty())
+        return;
+
+    graphicsContext.save();
+    graphicsContext.beginTransparencyLayer(1);
+    graphicsContext.setCompositeOperation(CompositeCopy);
+
+    m_client->drawRect(this, graphicsContext, paintRect);
+
+    graphicsContext.endTransparencyLayer();
+    graphicsContext.restore();
+}
+    
+bool PageOverlay::mouseEvent(const WebMouseEvent& mouseEvent)
+{
+    // Ignore events outside the bounds.
+    if (!bounds().contains(mouseEvent.position()))
+        return false;
+
+    return m_client->mouseEvent(this, mouseEvent);
+}
+
+} // namespace WebKit