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diff --git a/WebCore/platform/mac/WheelEventMac.mm b/WebCore/platform/mac/WheelEventMac.mm
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+++ b/WebCore/platform/mac/WheelEventMac.mm
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+/*
+ * Copyright (C) 2004, 2006 Apple Computer, 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 COMPUTER, 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 COMPUTER, 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. 
+ */
+
+#import "config.h"
+#import "PlatformWheelEvent.h"
+
+#import "PlatformMouseEvent.h"
+#import "WebCoreSystemInterface.h"
+
+namespace WebCore {
+
+PlatformWheelEvent::PlatformWheelEvent(NSEvent* event)
+    : m_position(pointForEvent(event))
+    , m_globalPosition(globalPointForEvent(event))
+    , m_isAccepted(false)
+    , m_shiftKey([event modifierFlags] & NSShiftKeyMask)
+    , m_ctrlKey([event modifierFlags] & NSControlKeyMask)
+    , m_altKey([event modifierFlags] & NSAlternateKeyMask)
+    , m_metaKey([event modifierFlags] & NSCommandKeyMask)
+{
+    BOOL continuous;
+    wkGetWheelEventDeltas(event, &m_deltaX, &m_deltaY, &continuous);
+    m_granularity = continuous ? ScrollByPixelWheelEvent : ScrollByLineWheelEvent;
+    if (m_granularity == ScrollByLineWheelEvent) {
+        m_deltaX *= horizontalLineMultiplier();
+        m_deltaY *= verticalLineMultiplier();
+    }
+}
+
+} // namespace WebCore