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diff --git a/Source/WebKit2/WebProcess/WebPage/CoordinatedGraphics/ThreadedCoordinatedLayerTreeHost.cpp b/Source/WebKit2/WebProcess/WebPage/CoordinatedGraphics/ThreadedCoordinatedLayerTreeHost.cpp
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index 000000000..281353b8a
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+++ b/Source/WebKit2/WebProcess/WebPage/CoordinatedGraphics/ThreadedCoordinatedLayerTreeHost.cpp
@@ -0,0 +1,252 @@
+/*
+ * Copyright (C) 2011 Apple Inc. All rights reserved.
+ * Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+ * Copyright (C) 2012 Company 100, Inc.
+ * Copyright (C) 2014 Igalia S.L.
+ *
+ * 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 "ThreadedCoordinatedLayerTreeHost.h"
+
+#if USE(COORDINATED_GRAPHICS_THREADED)
+
+#include "AcceleratedSurface.h"
+#include "WebPage.h"
+#include <WebCore/FrameView.h>
+#include <WebCore/MainFrame.h>
+
+using namespace WebCore;
+
+namespace WebKit {
+
+Ref<ThreadedCoordinatedLayerTreeHost> ThreadedCoordinatedLayerTreeHost::create(WebPage& webPage)
+{
+    return adoptRef(*new ThreadedCoordinatedLayerTreeHost(webPage));
+}
+
+ThreadedCoordinatedLayerTreeHost::~ThreadedCoordinatedLayerTreeHost()
+{
+}
+
+ThreadedCoordinatedLayerTreeHost::ThreadedCoordinatedLayerTreeHost(WebPage& webPage)
+    : CoordinatedLayerTreeHost(webPage)
+    , m_compositorClient(*this)
+    , m_surface(AcceleratedSurface::create(webPage))
+    , m_viewportController(webPage.size())
+{
+    if (FrameView* frameView = m_webPage.mainFrameView()) {
+        auto contentsSize = frameView->contentsSize();
+        if (!contentsSize.isEmpty())
+            m_viewportController.didChangeContentsSize(contentsSize);
+    }
+
+    IntSize scaledSize(m_webPage.size());
+    scaledSize.scale(m_webPage.deviceScaleFactor());
+    float scaleFactor = m_webPage.deviceScaleFactor() * m_viewportController.pageScaleFactor();
+
+    if (m_surface) {
+        TextureMapper::PaintFlags paintFlags = 0;
+
+        if (m_surface->shouldPaintMirrored())
+            paintFlags |= TextureMapper::PaintingMirrored;
+
+        // Do not do frame sync when rendering offscreen in the web process to ensure that SwapBuffers never blocks.
+        // Rendering to the actual screen will happen later anyway since the UI process schedules a redraw for every update,
+        // the compositor will take care of syncing to vblank.
+        m_compositor = ThreadedCompositor::create(m_compositorClient, scaledSize, scaleFactor, m_surface->window(), ThreadedCompositor::ShouldDoFrameSync::No, paintFlags);
+        m_layerTreeContext.contextID = m_surface->surfaceID();
+    } else
+        m_compositor = ThreadedCompositor::create(m_compositorClient, scaledSize, scaleFactor);
+
+    didChangeViewport();
+}
+
+void ThreadedCoordinatedLayerTreeHost::invalidate()
+{
+    m_compositor->invalidate();
+    CoordinatedLayerTreeHost::invalidate();
+    m_surface = nullptr;
+}
+
+void ThreadedCoordinatedLayerTreeHost::forceRepaint()
+{
+    CoordinatedLayerTreeHost::forceRepaint();
+    m_compositor->forceRepaint();
+}
+
+void ThreadedCoordinatedLayerTreeHost::scrollNonCompositedContents(const IntRect& rect)
+{
+    FrameView* frameView = m_webPage.mainFrameView();
+    if (!frameView || !frameView->delegatesScrolling())
+        return;
+
+    m_viewportController.didScroll(rect.location());
+    if (m_isDiscardable)
+        m_discardableSyncActions |= DiscardableSyncActions::UpdateViewport;
+    else
+        didChangeViewport();
+}
+
+void ThreadedCoordinatedLayerTreeHost::contentsSizeChanged(const IntSize& newSize)
+{
+    m_viewportController.didChangeContentsSize(newSize);
+    if (m_isDiscardable)
+        m_discardableSyncActions |= DiscardableSyncActions::UpdateViewport;
+    else
+        didChangeViewport();
+}
+
+void ThreadedCoordinatedLayerTreeHost::deviceOrPageScaleFactorChanged()
+{
+    if (m_isDiscardable) {
+        m_discardableSyncActions |= DiscardableSyncActions::UpdateScale;
+        return;
+    }
+
+    if (m_surface && m_surface->resize(m_webPage.size()))
+        m_layerTreeContext.contextID = m_surface->surfaceID();
+
+    CoordinatedLayerTreeHost::deviceOrPageScaleFactorChanged();
+    m_compositor->setScaleFactor(m_webPage.deviceScaleFactor() * m_viewportController.pageScaleFactor());
+}
+
+void ThreadedCoordinatedLayerTreeHost::pageBackgroundTransparencyChanged()
+{
+    if (m_isDiscardable) {
+        m_discardableSyncActions |= DiscardableSyncActions::UpdateBackground;
+        return;
+    }
+
+    CoordinatedLayerTreeHost::pageBackgroundTransparencyChanged();
+    m_compositor->setDrawsBackground(m_webPage.drawsBackground());
+}
+
+void ThreadedCoordinatedLayerTreeHost::sizeDidChange(const IntSize& size)
+{
+    if (m_isDiscardable) {
+        m_discardableSyncActions |= DiscardableSyncActions::UpdateSize;
+        m_viewportController.didChangeViewportSize(size);
+        return;
+    }
+
+    if (m_surface && m_surface->resize(size))
+        m_layerTreeContext.contextID = m_surface->surfaceID();
+
+    CoordinatedLayerTreeHost::sizeDidChange(size);
+    m_viewportController.didChangeViewportSize(size);
+    IntSize scaledSize(size);
+    scaledSize.scale(m_webPage.deviceScaleFactor());
+    m_compositor->setViewportSize(scaledSize, m_webPage.deviceScaleFactor() * m_viewportController.pageScaleFactor());
+    didChangeViewport();
+}
+
+void ThreadedCoordinatedLayerTreeHost::didChangeViewportAttributes(ViewportAttributes&& attr)
+{
+    m_viewportController.didChangeViewportAttributes(WTFMove(attr));
+    if (m_isDiscardable)
+        m_discardableSyncActions |= DiscardableSyncActions::UpdateViewport;
+    else
+        didChangeViewport();
+}
+
+#if PLATFORM(GTK) && PLATFORM(X11) && !USE(REDIRECTED_XCOMPOSITE_WINDOW)
+void ThreadedCoordinatedLayerTreeHost::setNativeSurfaceHandleForCompositing(uint64_t handle)
+{
+    m_layerTreeContext.contextID = handle;
+    m_compositor->setNativeSurfaceHandleForCompositing(handle);
+    scheduleLayerFlush();
+}
+#endif
+
+void ThreadedCoordinatedLayerTreeHost::didChangeViewport()
+{
+    FloatRect visibleRect(m_viewportController.visibleContentsRect());
+    if (visibleRect.isEmpty())
+        return;
+
+    // When using non overlay scrollbars, the contents size doesn't include the scrollbars, but we need to include them
+    // in the visible area used by the compositor to ensure that the scrollbar layers are also updated.
+    // See https://bugs.webkit.org/show_bug.cgi?id=160450.
+    FrameView* view = m_webPage.corePage()->mainFrame().view();
+    Scrollbar* scrollbar = view->verticalScrollbar();
+    if (scrollbar && !scrollbar->isOverlayScrollbar())
+        visibleRect.expand(scrollbar->width(), 0);
+    scrollbar = view->horizontalScrollbar();
+    if (scrollbar && !scrollbar->isOverlayScrollbar())
+        visibleRect.expand(0, scrollbar->height());
+
+    CoordinatedLayerTreeHost::setVisibleContentsRect(visibleRect, FloatPoint::zero());
+
+    float pageScale = m_viewportController.pageScaleFactor();
+    IntPoint scrollPosition = roundedIntPoint(visibleRect.location());
+    if (m_lastScrollPosition != scrollPosition) {
+        m_lastScrollPosition = scrollPosition;
+        m_compositor->setScrollPosition(m_lastScrollPosition, m_webPage.deviceScaleFactor() * pageScale);
+
+        if (!view->useFixedLayout())
+            view->notifyScrollPositionChanged(m_lastScrollPosition);
+    }
+
+    if (m_lastPageScaleFactor != pageScale) {
+        m_lastPageScaleFactor = pageScale;
+        m_webPage.scalePage(pageScale, m_lastScrollPosition);
+    }
+}
+
+void ThreadedCoordinatedLayerTreeHost::commitSceneState(const CoordinatedGraphicsState& state)
+{
+    CoordinatedLayerTreeHost::commitSceneState(state);
+    m_compositor->updateSceneState(state);
+}
+
+void ThreadedCoordinatedLayerTreeHost::setIsDiscardable(bool discardable)
+{
+    m_isDiscardable = discardable;
+    if (m_isDiscardable) {
+        m_discardableSyncActions = OptionSet<DiscardableSyncActions>();
+        return;
+    }
+
+    if (m_discardableSyncActions.isEmpty())
+        return;
+
+    if (m_discardableSyncActions.contains(DiscardableSyncActions::UpdateBackground))
+        pageBackgroundTransparencyChanged();
+
+    if (m_discardableSyncActions.contains(DiscardableSyncActions::UpdateSize)) {
+        // Size changes already sets the scale factor and updates the viewport.
+        sizeDidChange(m_webPage.size());
+        return;
+    }
+
+    if (m_discardableSyncActions.contains(DiscardableSyncActions::UpdateScale))
+        deviceOrPageScaleFactorChanged();
+
+    if (m_discardableSyncActions.contains(DiscardableSyncActions::UpdateViewport))
+        didChangeViewport();
+}
+
+} // namespace WebKit
+
+#endif // USE(COORDINATED_GRAPHICS)