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diff --git a/Source/WebKit2/WebProcess/WebPage/TiledDrawingArea.cpp b/Source/WebKit2/WebProcess/WebPage/TiledDrawingArea.cpp
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+++ b/Source/WebKit2/WebProcess/WebPage/TiledDrawingArea.cpp
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+/*
+ * Copyright (C) 2010, 2011 Nokia Corporation and/or its subsidiary(-ies)
+ *
+ * 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 "config.h"
+#include "TiledDrawingArea.h"
+
+#if USE(TILED_BACKING_STORE)
+
+#include "DrawingAreaProxyMessages.h"
+#include "MessageID.h"
+#include "UpdateInfo.h"
+#include "WebCoreArgumentCoders.h"
+#include "WebPage.h"
+#include "WebProcess.h"
+
+using namespace WebCore;
+
+namespace WebKit {
+
+TiledDrawingArea::TiledDrawingArea(WebPage* webPage)
+    : DrawingArea(DrawingAreaTypeTiled, webPage)
+    , m_suspended(false)
+    , m_isWaitingForUIProcess(false)
+    , m_didSendTileUpdate(false)
+    , m_mainBackingStore(adoptPtr(new TiledBackingStore(this, TiledBackingStoreRemoteTileBackend::create(this))))
+{
+}
+
+TiledDrawingArea::~TiledDrawingArea()
+{
+}
+
+void TiledDrawingArea::scroll(const IntRect& scrollRect, const IntSize& scrollDelta)
+{
+    // FIXME: Do something much smarter.
+    setNeedsDisplay(scrollRect);
+}
+
+void TiledDrawingArea::setNeedsDisplay(const IntRect& rect)
+{
+    m_mainBackingStore->invalidate(rect);
+}
+
+void TiledDrawingArea::setSize(const IntSize& viewSize)
+{
+    ASSERT(!m_suspended);
+    ASSERT_ARG(viewSize, !viewSize.isEmpty());
+
+    m_webPage->setSize(viewSize);
+}
+
+void TiledDrawingArea::setVisibleContentRectAndScale(const WebCore::IntRect& visibleContentsRect, float scale)
+{
+    m_visibleContentRect = visibleContentsRect;
+
+    if (scale != m_mainBackingStore->contentsScale()) {
+        // Keep the tiles for the previous scale until enough content is available to be shown on the screen for the new scale.
+        // If we already have a previous set of tiles it means that two scale changed happened successively.
+        // In that case, make sure that our current main tiles have more content to show than the "previous previous"
+        // within the visible rect before replacing it.
+        if (!m_previousBackingStore || m_mainBackingStore->coverageRatio(m_visibleContentRect) > m_previousBackingStore->coverageRatio(m_visibleContentRect))
+            m_previousBackingStore = m_mainBackingStore.release();
+
+        m_mainBackingStore = adoptPtr(new TiledBackingStore(this, TiledBackingStoreRemoteTileBackend::create(this)));
+        m_mainBackingStore->setContentsScale(scale);
+    } else
+        m_mainBackingStore->adjustVisibleRect();
+}
+
+void TiledDrawingArea::setVisibleContentRectTrajectoryVector(const WebCore::FloatPoint& trajectoryVector)
+{
+    m_mainBackingStore->setVisibleRectTrajectoryVector(trajectoryVector);
+}
+
+void TiledDrawingArea::renderNextFrame()
+{
+    m_isWaitingForUIProcess = false;
+    m_mainBackingStore->updateTileBuffers();
+}
+
+void TiledDrawingArea::suspendPainting()
+{
+    ASSERT(!m_suspended);
+
+    m_suspended = true;
+}
+
+void TiledDrawingArea::resumePainting()
+{
+    ASSERT(m_suspended);
+
+    m_suspended = false;
+    m_mainBackingStore->updateTileBuffers();
+}
+
+void TiledDrawingArea::tiledBackingStorePaintBegin()
+{
+    m_webPage->layoutIfNeeded();
+}
+
+void TiledDrawingArea::tiledBackingStorePaint(GraphicsContext* graphicsContext, const IntRect& contentRect)
+{
+    m_webPage->drawRect(*graphicsContext, contentRect);
+}
+
+void TiledDrawingArea::tiledBackingStorePaintEnd(const Vector<IntRect>& paintedArea)
+{
+    if (m_didSendTileUpdate) {
+        // Since we know that all tile updates following a page invalidate will all be rendered
+        // in one paint pass for all the tiles, we can send the swap tile message here.
+        m_webPage->send(Messages::DrawingAreaProxy::DidRenderFrame());
+        m_isWaitingForUIProcess = true;
+        m_didSendTileUpdate = false;
+
+        // Make sure that we destroy the previous backing store and remove its tiles only after DidRenderFrame
+        // was sent to swap recently created tiles' buffer. Else a frame could be rendered after the previous
+        // tiles were removed and before the new tile have their first back buffer swapped.
+        if (m_previousBackingStore && m_mainBackingStore->coverageRatio(m_visibleContentRect) >= 1.0f)
+            m_previousBackingStore.clear();
+    }
+}
+
+bool TiledDrawingArea::tiledBackingStoreUpdatesAllowed() const
+{
+    return !m_suspended && !m_isWaitingForUIProcess;
+}
+
+IntRect TiledDrawingArea::tiledBackingStoreContentsRect()
+{
+    return IntRect(IntPoint::zero(), m_webPage->size());
+}
+
+IntRect TiledDrawingArea::tiledBackingStoreVisibleRect()
+{
+    return m_visibleContentRect;
+}
+
+Color TiledDrawingArea::tiledBackingStoreBackgroundColor() const
+{
+    return Color::transparent;
+}
+
+void TiledDrawingArea::createTile(int tileID, const UpdateInfo& updateInfo)
+{
+    m_webPage->send(Messages::DrawingAreaProxy::CreateTile(tileID, updateInfo));
+    m_didSendTileUpdate = true;
+}
+void TiledDrawingArea::updateTile(int tileID, const UpdateInfo& updateInfo)
+{
+    m_webPage->send(Messages::DrawingAreaProxy::UpdateTile(tileID, updateInfo));
+    m_didSendTileUpdate = true;
+}
+void TiledDrawingArea::removeTile(int tileID)
+{
+    m_webPage->send(Messages::DrawingAreaProxy::RemoveTile(tileID));
+}
+
+#if USE(ACCELERATED_COMPOSITING) && USE(TEXTURE_MAPPER)
+void TiledDrawingArea::didReceiveLayerTreeHostMessage(CoreIPC::Connection* connection, CoreIPC::MessageID, CoreIPC::ArgumentDecoder* arguments)
+{
+}
+#endif
+} // namespace WebKit
+
+#endif // USE(TILED_BACKING_STORE)