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diff --git a/WebKit/mac/WebView/WebDynamicScrollBarsView.m b/WebKit/mac/WebView/WebDynamicScrollBarsView.m
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+/*
+ * Copyright (C) 2005, 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. 
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE 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 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.
+ */
+
+#import "WebDynamicScrollBarsViewInternal.h"
+
+#import "WebDocument.h"
+#import "WebFrameView.h"
+#import <WebKitSystemInterface.h>
+
+using namespace WebCore;
+
+// FIXME: <rdar://problem/5898985> Mail expects a constant of this name to exist.
+const int WebCoreScrollbarAlwaysOn = ScrollbarAlwaysOn;
+
+@implementation WebDynamicScrollBarsView
+
+- (void)setAllowsHorizontalScrolling:(BOOL)flag
+{
+    if (hScrollModeLocked)
+        return;
+    if (flag && hScroll == ScrollbarAlwaysOff)
+        hScroll = ScrollbarAuto;
+    else if (!flag && hScroll != ScrollbarAlwaysOff)
+        hScroll = ScrollbarAlwaysOff;
+    [self updateScrollers];
+}
+
+@end
+
+@implementation WebDynamicScrollBarsView (WebInternal)
+
+- (void)setSuppressLayout:(BOOL)flag;
+{
+    suppressLayout = flag;
+}
+
+- (void)setScrollBarsSuppressed:(BOOL)suppressed repaintOnUnsuppress:(BOOL)repaint
+{
+    suppressScrollers = suppressed;
+
+    // This code was originally changes for a Leopard performance imporvement. We decided to 
+    // ifdef it to fix correctness issues on Tiger documented in <rdar://problem/5441823>.
+#ifndef BUILDING_ON_TIGER
+    if (suppressed) {
+        [[self verticalScroller] setNeedsDisplay:NO];
+        [[self horizontalScroller] setNeedsDisplay:NO];
+    }
+        
+    if (!suppressed && repaint)
+        [super reflectScrolledClipView:[self contentView]];
+#else
+    if (suppressed || repaint) { 
+        [[self verticalScroller] setNeedsDisplay: !suppressed]; 
+        [[self horizontalScroller] setNeedsDisplay: !suppressed]; 
+    }
+#endif
+}
+
+- (void)updateScrollers
+{
+    // We need to do the work below twice in the case where a scroll bar disappears,
+    // making the second layout have a wider width than the first. Doing it more than
+    // twice would indicate some kind of infinite loop, so we do it at most twice.
+    // It's quite efficient to do this work twice in the normal case, so we don't bother
+    // trying to figure out of the second pass is needed or not.
+    if (inUpdateScrollers)
+        return;
+    
+    inUpdateScrollers = true;
+
+    int pass;
+    BOOL hasVerticalScroller = [self hasVerticalScroller];
+    BOOL hasHorizontalScroller = [self hasHorizontalScroller];
+    BOOL oldHasVertical = hasVerticalScroller;
+    BOOL oldHasHorizontal = hasHorizontalScroller;
+
+    for (pass = 0; pass < 2; pass++) {
+        BOOL scrollsVertically;
+        BOOL scrollsHorizontally;
+
+        if (!suppressLayout && !suppressScrollers && (hScroll == ScrollbarAuto || vScroll == ScrollbarAuto)) {
+            // Do a layout if pending, before checking if scrollbars are needed.
+            // This fixes 2969367, although may introduce a slowdown in live resize performance.
+            NSView *documentView = [self documentView];
+            if (!documentView) {
+                scrollsHorizontally = NO;
+                scrollsVertically = NO;
+            } else {
+                if ((hasVerticalScroller != oldHasVertical ||
+                    hasHorizontalScroller != oldHasHorizontal || [documentView inLiveResize]) && [documentView conformsToProtocol:@protocol(WebDocumentView)]) {
+                    [(id <WebDocumentView>)documentView setNeedsLayout: YES];
+                    [(id <WebDocumentView>)documentView layout];
+                }
+
+                NSSize documentSize = [documentView frame].size;
+                NSSize frameSize = [self frame].size;
+
+                scrollsVertically = (vScroll == ScrollbarAlwaysOn) ||
+                    (vScroll == ScrollbarAuto && documentSize.height > frameSize.height);
+                if (scrollsVertically)
+                    scrollsHorizontally = (hScroll == ScrollbarAlwaysOn) ||
+                        (hScroll == ScrollbarAuto && documentSize.width + [NSScroller scrollerWidth] > frameSize.width);
+                else {
+                    scrollsHorizontally = (hScroll == ScrollbarAlwaysOn) ||
+                        (hScroll == ScrollbarAuto && documentSize.width > frameSize.width);
+                    if (scrollsHorizontally)
+                        scrollsVertically = (vScroll == ScrollbarAlwaysOn) ||
+                            (vScroll == ScrollbarAuto && documentSize.height + [NSScroller scrollerWidth] > frameSize.height);
+                }
+            }
+        } else {
+            scrollsHorizontally = (hScroll == ScrollbarAuto) ? hasHorizontalScroller : (hScroll == ScrollbarAlwaysOn);
+            scrollsVertically = (vScroll == ScrollbarAuto) ? hasVerticalScroller : (vScroll == ScrollbarAlwaysOn);
+        }
+
+        if (hasVerticalScroller != scrollsVertically) {
+            [self setHasVerticalScroller:scrollsVertically];
+            hasVerticalScroller = scrollsVertically;
+        }
+
+        if (hasHorizontalScroller != scrollsHorizontally) {
+            [self setHasHorizontalScroller:scrollsHorizontally];
+            hasHorizontalScroller = scrollsHorizontally;
+        }
+    }
+
+    if (suppressScrollers) {
+        [[self verticalScroller] setNeedsDisplay: NO];
+        [[self horizontalScroller] setNeedsDisplay: NO];
+    }
+
+    inUpdateScrollers = false;
+}
+
+// Make the horizontal and vertical scroll bars come and go as needed.
+- (void)reflectScrolledClipView:(NSClipView *)clipView
+{
+    if (clipView == [self contentView]) {
+        // FIXME: This hack here prevents infinite recursion that takes place when we
+        // gyrate between having a vertical scroller and not having one. A reproducible
+        // case is clicking on the "the Policy Routing text" link at
+        // http://www.linuxpowered.com/archive/howto/Net-HOWTO-8.html.
+        // The underlying cause is some problem in the NSText machinery, but I was not
+        // able to pin it down.
+        if (!inUpdateScrollers && [[NSGraphicsContext currentContext] isDrawingToScreen])
+            [self updateScrollers];
+    }
+
+    // This code was originally changed for a Leopard performance imporvement. We decided to 
+    // ifdef it to fix correctness issues on Tiger documented in <rdar://problem/5441823>.
+#ifndef BUILDING_ON_TIGER
+    // Update the scrollers if they're not being suppressed.
+    if (!suppressScrollers)
+        [super reflectScrolledClipView:clipView];
+#else
+    [super reflectScrolledClipView:clipView]; 
+  
+    // Validate the scrollers if they're being suppressed. 
+    if (suppressScrollers) { 
+        [[self verticalScroller] setNeedsDisplay: NO]; 
+        [[self horizontalScroller] setNeedsDisplay: NO]; 
+    }
+#endif
+}
+
+- (BOOL)allowsHorizontalScrolling
+{
+    return hScroll != ScrollbarAlwaysOff;
+}
+
+- (BOOL)allowsVerticalScrolling
+{
+    return vScroll != ScrollbarAlwaysOff;
+}
+
+- (void)scrollingModes:(WebCore::ScrollbarMode*)hMode vertical:(WebCore::ScrollbarMode*)vMode
+{
+    *hMode = static_cast<ScrollbarMode>(hScroll);
+    *vMode = static_cast<ScrollbarMode>(vScroll);
+}
+
+- (ScrollbarMode)horizontalScrollingMode
+{
+    return static_cast<ScrollbarMode>(hScroll);
+}
+
+- (ScrollbarMode)verticalScrollingMode
+{
+    return static_cast<ScrollbarMode>(vScroll);
+}
+
+- (void)setHorizontalScrollingMode:(ScrollbarMode)horizontalMode andLock:(BOOL)lock
+{
+    [self setScrollingModes:horizontalMode vertical:[self verticalScrollingMode] andLock:lock];
+}
+
+- (void)setVerticalScrollingMode:(ScrollbarMode)verticalMode andLock:(BOOL)lock
+{
+    [self setScrollingModes:[self horizontalScrollingMode] vertical:verticalMode andLock:lock];
+}
+
+- (void)setScrollingModes:(ScrollbarMode)horizontalMode vertical:(ScrollbarMode)verticalMode andLock:(BOOL)lock
+{
+    BOOL update = NO;
+    if (verticalMode != vScroll && !vScrollModeLocked) {
+        vScroll = verticalMode;
+        update = YES;
+    }
+
+    if (horizontalMode != hScroll && !hScrollModeLocked) {
+        hScroll = horizontalMode;
+        update = YES;
+    }
+
+    if (lock)
+        [self setScrollingModesLocked:YES];
+
+    if (update)
+        [self updateScrollers];
+}
+
+- (void)setHorizontalScrollingModeLocked:(BOOL)locked
+{
+    hScrollModeLocked = locked;
+}
+
+- (void)setVerticalScrollingModeLocked:(BOOL)locked
+{
+    vScrollModeLocked = locked;
+}
+
+- (void)setScrollingModesLocked:(BOOL)locked
+{
+    hScrollModeLocked = vScrollModeLocked = locked;
+}
+
+- (BOOL)horizontalScrollingModeLocked
+{
+    return hScrollModeLocked;
+}
+
+- (BOOL)verticalScrollingModeLocked
+{
+    return vScrollModeLocked;
+}
+
+- (BOOL)autoforwardsScrollWheelEvents
+{
+    return YES;
+}
+
+- (void)scrollWheel:(NSEvent *)event
+{
+    float deltaX;
+    float deltaY;
+    BOOL isContinuous;
+    WKGetWheelEventDeltas(event, &deltaX, &deltaY, &isContinuous);
+
+    if (fabsf(deltaY) > fabsf(deltaX)) {
+        if (![self allowsVerticalScrolling]) {
+            [[self nextResponder] scrollWheel:event];
+            return;
+        }
+    } else if (![self allowsHorizontalScrolling]) {
+        [[self nextResponder] scrollWheel:event];
+        return;
+    }
+
+    [super scrollWheel:event];
+}
+
+- (BOOL)accessibilityIsIgnored 
+{
+    id docView = [self documentView];
+    if ([docView isKindOfClass:[WebFrameView class]] && ![(WebFrameView *)docView allowsScrolling])
+        return YES;
+    
+    return [super accessibilityIsIgnored];
+}
+
+@end