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diff --git a/Source/WebCore/platform/gtk/ScrollbarThemeGtk.cpp b/Source/WebCore/platform/gtk/ScrollbarThemeGtk.cpp
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+++ b/Source/WebCore/platform/gtk/ScrollbarThemeGtk.cpp
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+/*
+ * Copyright (C) 2008 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. ``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
+ * 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 "ScrollbarThemeGtk.h"
+
+#include "PlatformMouseEvent.h"
+#include "RenderThemeGtk.h"
+#include "ScrollView.h"
+#include "Scrollbar.h"
+
+namespace WebCore {
+
+static HashSet<Scrollbar*>* gScrollbars;
+
+ScrollbarTheme* ScrollbarTheme::nativeTheme()
+{
+    static ScrollbarThemeGtk theme;
+    return &theme;
+}
+
+ScrollbarThemeGtk::~ScrollbarThemeGtk()
+{
+}
+
+void ScrollbarThemeGtk::registerScrollbar(Scrollbar* scrollbar)
+{
+    if (!gScrollbars)
+        gScrollbars = new HashSet<Scrollbar*>;
+    gScrollbars->add(scrollbar);
+}
+
+void ScrollbarThemeGtk::unregisterScrollbar(Scrollbar* scrollbar)
+{
+    gScrollbars->remove(scrollbar);
+    if (gScrollbars->isEmpty()) {
+        delete gScrollbars;
+        gScrollbars = 0;
+    }
+}
+
+void ScrollbarThemeGtk::updateScrollbarsFrameThickness()
+{
+    if (!gScrollbars)
+        return;
+
+    // Update the thickness of every interior frame scrollbar widget. The
+    // platform-independent scrollbar them code isn't yet smart enough to get
+    // this information when it paints.
+    HashSet<Scrollbar*>::iterator end = gScrollbars->end();
+    for (HashSet<Scrollbar*>::iterator it = gScrollbars->begin(); it != end; ++it) {
+        Scrollbar* scrollbar = (*it);
+
+        // Top-level scrollbar i.e. scrollbars who have a parent ScrollView
+        // with no parent are native, and thus do not need to be resized.
+        if (!scrollbar->parent() || !scrollbar->parent()->parent())
+            return;
+
+        int thickness = scrollbarThickness(scrollbar->controlSize());
+        if (scrollbar->orientation() == HorizontalScrollbar)
+            scrollbar->setFrameRect(IntRect(0, scrollbar->parent()->height() - thickness, scrollbar->width(), thickness));
+        else
+            scrollbar->setFrameRect(IntRect(scrollbar->parent()->width() - thickness, 0, thickness, scrollbar->height()));
+    }
+}
+
+bool ScrollbarThemeGtk::hasThumb(Scrollbar* scrollbar)
+{
+    // This method is just called as a paint-time optimization to see if
+    // painting the thumb can be skipped.  We don't have to be exact here.
+    return thumbLength(scrollbar) > 0;
+}
+
+IntRect ScrollbarThemeGtk::backButtonRect(Scrollbar* scrollbar, ScrollbarPart part, bool)
+{
+    if (part == BackButtonEndPart && !m_hasBackButtonEndPart)
+        return IntRect();
+
+    int x = scrollbar->x() + m_troughBorderWidth;
+    int y = scrollbar->y() + m_troughBorderWidth;
+    IntSize size = buttonSize(scrollbar);
+    if (part == BackButtonStartPart)
+        return IntRect(x, y, size.width(), size.height());
+
+    // BackButtonEndPart (alternate button)
+    if (scrollbar->orientation() == HorizontalScrollbar)
+        return IntRect(scrollbar->x() + scrollbar->width() - m_troughBorderWidth - (2 * size.width()), y, size.width(), size.height());
+
+    // VerticalScrollbar alternate button
+    return IntRect(x, scrollbar->y() + scrollbar->height() - m_troughBorderWidth - (2 * size.height()), size.width(), size.height());
+}
+
+IntRect ScrollbarThemeGtk::forwardButtonRect(Scrollbar* scrollbar, ScrollbarPart part, bool)
+{
+    if (part == ForwardButtonStartPart && !m_hasForwardButtonStartPart)
+        return IntRect();
+
+    IntSize size = buttonSize(scrollbar);
+    if (scrollbar->orientation() == HorizontalScrollbar) {
+        int y = scrollbar->y() + m_troughBorderWidth;
+        if (part == ForwardButtonEndPart)
+            return IntRect(scrollbar->x() + scrollbar->width() - size.width() - m_troughBorderWidth, y, size.width(), size.height());
+
+        // ForwardButtonStartPart (alternate button)
+        return IntRect(scrollbar->x() + m_troughBorderWidth + size.width(), y, size.width(), size.height());
+    }
+
+    // VerticalScrollbar
+    int x = scrollbar->x() + m_troughBorderWidth;
+    if (part == ForwardButtonEndPart)
+        return IntRect(x, scrollbar->y() + scrollbar->height() - size.height() - m_troughBorderWidth, size.width(), size.height());
+
+    // ForwardButtonStartPart (alternate button)
+    return IntRect(x, scrollbar->y() + m_troughBorderWidth + size.height(), size.width(), size.height());
+}
+
+IntRect ScrollbarThemeGtk::trackRect(Scrollbar* scrollbar, bool)
+{
+    // The padding along the thumb movement axis (from outside to in)
+    // is the size of trough border plus the size of the stepper (button)
+    // plus the size of stepper spacing (the space between the stepper and
+    // the place where the thumb stops). There is often no stepper spacing.
+    int movementAxisPadding = m_troughBorderWidth + m_stepperSize + m_stepperSpacing;
+
+    // The fatness of the scrollbar on the non-movement axis.
+    int thickness = scrollbarThickness(scrollbar->controlSize());
+
+    int alternateButtonOffset = 0;
+    int alternateButtonWidth = 0;
+    if (m_hasForwardButtonStartPart) {
+        alternateButtonOffset += m_stepperSize;
+        alternateButtonWidth += m_stepperSize;
+    }
+    if (m_hasBackButtonEndPart)
+        alternateButtonWidth += m_stepperSize;
+
+    if (scrollbar->orientation() == HorizontalScrollbar) {
+        // Once the scrollbar becomes smaller than the natural size of the
+        // two buttons, the track disappears.
+        if (scrollbar->width() < 2 * thickness)
+            return IntRect();
+        return IntRect(scrollbar->x() + movementAxisPadding + alternateButtonOffset, scrollbar->y(),
+                       scrollbar->width() - (2 * movementAxisPadding) - alternateButtonWidth, thickness);
+    }
+
+    if (scrollbar->height() < 2 * thickness)
+        return IntRect();
+    return IntRect(scrollbar->x(), scrollbar->y() + movementAxisPadding + alternateButtonOffset,
+                   thickness, scrollbar->height() - (2 * movementAxisPadding) - alternateButtonWidth);
+}
+
+IntRect ScrollbarThemeGtk::thumbRect(Scrollbar* scrollbar, const IntRect& unconstrainedTrackRect)
+{
+    IntRect trackRect = constrainTrackRectToTrackPieces(scrollbar, unconstrainedTrackRect);
+    int thumbPos = thumbPosition(scrollbar);
+    if (scrollbar->orientation() == HorizontalScrollbar)
+        return IntRect(trackRect.x() + thumbPos, trackRect.y() + (trackRect.height() - m_thumbFatness) / 2, thumbLength(scrollbar), m_thumbFatness); 
+
+    // VerticalScrollbar
+    return IntRect(trackRect.x() + (trackRect.width() - m_thumbFatness) / 2, trackRect.y() + thumbPos, m_thumbFatness, thumbLength(scrollbar));
+}
+
+bool ScrollbarThemeGtk::paint(Scrollbar* scrollbar, GraphicsContext* graphicsContext, const IntRect& damageRect)
+{
+    if (graphicsContext->paintingDisabled())
+        return false;
+
+    // Create the ScrollbarControlPartMask based on the damageRect
+    ScrollbarControlPartMask scrollMask = NoPart;
+
+    IntRect backButtonStartPaintRect;
+    IntRect backButtonEndPaintRect;
+    IntRect forwardButtonStartPaintRect;
+    IntRect forwardButtonEndPaintRect;
+    if (hasButtons(scrollbar)) {
+        backButtonStartPaintRect = backButtonRect(scrollbar, BackButtonStartPart, true);
+        if (damageRect.intersects(backButtonStartPaintRect))
+            scrollMask |= BackButtonStartPart;
+        backButtonEndPaintRect = backButtonRect(scrollbar, BackButtonEndPart, true);
+        if (damageRect.intersects(backButtonEndPaintRect))
+            scrollMask |= BackButtonEndPart;
+        forwardButtonStartPaintRect = forwardButtonRect(scrollbar, ForwardButtonStartPart, true);
+        if (damageRect.intersects(forwardButtonStartPaintRect))
+            scrollMask |= ForwardButtonStartPart;
+        forwardButtonEndPaintRect = forwardButtonRect(scrollbar, ForwardButtonEndPart, true);
+        if (damageRect.intersects(forwardButtonEndPaintRect))
+            scrollMask |= ForwardButtonEndPart;
+    }
+
+    IntRect trackPaintRect = trackRect(scrollbar, true);
+    if (damageRect.intersects(trackPaintRect))
+        scrollMask |= TrackBGPart;
+
+    if (m_troughUnderSteppers && (scrollMask & BackButtonStartPart
+            || scrollMask & BackButtonEndPart
+            || scrollMask & ForwardButtonStartPart
+            || scrollMask & ForwardButtonEndPart))
+        scrollMask |= TrackBGPart;
+
+    bool thumbPresent = hasThumb(scrollbar);
+    IntRect currentThumbRect;
+    if (thumbPresent) {
+        IntRect track = trackRect(scrollbar, false);
+        currentThumbRect = thumbRect(scrollbar, track);
+        if (damageRect.intersects(currentThumbRect))
+            scrollMask |= ThumbPart;
+    }
+
+    paintScrollbarBackground(graphicsContext, scrollbar);
+
+    if (scrollMask & TrackBGPart)
+        paintTrackBackground(graphicsContext, scrollbar, trackPaintRect);
+
+    // Paint the back and forward buttons.
+    if (scrollMask & BackButtonStartPart)
+        paintButton(graphicsContext, scrollbar, backButtonStartPaintRect, BackButtonStartPart);
+    if (scrollMask & BackButtonEndPart)
+        paintButton(graphicsContext, scrollbar, backButtonEndPaintRect, BackButtonEndPart);
+    if (scrollMask & ForwardButtonStartPart)
+        paintButton(graphicsContext, scrollbar, forwardButtonStartPaintRect, ForwardButtonStartPart);
+    if (scrollMask & ForwardButtonEndPart)
+        paintButton(graphicsContext, scrollbar, forwardButtonEndPaintRect, ForwardButtonEndPart);
+
+    // Paint the thumb.
+    if (scrollMask & ThumbPart)
+        paintThumb(graphicsContext, scrollbar, currentThumbRect);
+
+    return true;
+}
+
+void ScrollbarThemeGtk::paintScrollCorner(ScrollView* view, GraphicsContext* context, const IntRect& cornerRect)
+{
+    // ScrollbarThemeComposite::paintScrollCorner incorrectly assumes that the
+    // ScrollView is a FrameView (see FramelessScrollView), so we cannot let
+    // that code run.  For FrameView's this is correct since we don't do custom
+    // scrollbar corner rendering, which ScrollbarThemeComposite supports.
+    ScrollbarTheme::paintScrollCorner(view, context, cornerRect);
+}
+
+bool ScrollbarThemeGtk::shouldCenterOnThumb(Scrollbar*, const PlatformMouseEvent& event)
+{
+    return (event.shiftKey() && event.button() == LeftButton) || (event.button() == MiddleButton);
+}
+
+int ScrollbarThemeGtk::scrollbarThickness(ScrollbarControlSize)
+{
+    return m_thumbFatness + (m_troughBorderWidth * 2);
+}
+
+IntSize ScrollbarThemeGtk::buttonSize(Scrollbar* scrollbar)
+{
+    if (scrollbar->orientation() == VerticalScrollbar)
+        return IntSize(m_thumbFatness, m_stepperSize);
+
+    // HorizontalScrollbar
+    return IntSize(m_stepperSize, m_thumbFatness);
+}
+
+int ScrollbarThemeGtk::minimumThumbLength(Scrollbar* scrollbar)
+{
+    return m_minThumbLength;
+}
+
+}
+