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diff --git a/WebKit/chromium/src/DragScrollTimer.h b/WebKit/chromium/src/DragScrollTimer.h
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+++ b/WebKit/chromium/src/DragScrollTimer.h
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+/*
+ * Copyright (C) 2010 Google 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER 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.
+ */
+
+#ifndef DragScrollTimer_h
+#define DragScrollTimer_h
+
+#include "IntSize.h"
+#include "Timer.h"
+#include "WebPoint.h"
+
+namespace WebCore { class FrameView; }
+
+namespace WebKit {
+
+//
+// Encapsulating a timer and associated state management for
+// scroll-on-drag behaviour.
+//
+class DragScrollTimer {
+public:
+    DragScrollTimer();
+    ~DragScrollTimer();
+
+    void fired(WebCore::Timer<DragScrollTimer>*) { update(); }
+    void triggerScroll(WebCore::FrameView*, const WebPoint&);
+    void stop();
+
+private:
+    void scroll();
+    void update();
+    WebCore::IntSize scrollDistanceFor(WebCore::FrameView*, const WebPoint&) const;
+    bool shouldScroll() const { return !m_lastDistance.isZero(); }
+
+    WebCore::Timer<DragScrollTimer> m_timer;
+    WebCore::FrameView* m_view;
+    WebCore::IntSize m_lastDistance;
+    bool m_scrolling;
+};
+
+} // namespace WebKit
+
+#endif