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diff --git a/Source/Platform/chromium/src/WebActiveGestureAnimation.h b/Source/Platform/chromium/src/WebActiveGestureAnimation.h
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+/*
+ * Copyright (C) 2012 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:
+ *
+ * 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 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.
+ */
+
+#ifndef WebActiveGestureAnimation_h
+#define WebActiveGestureAnimation_h
+
+#include <wtf/Noncopyable.h>
+#include <wtf/OwnPtr.h>
+#include <wtf/PassOwnPtr.h>
+
+namespace WebKit {
+
+class WebGestureCurve;
+class WebGestureCurveTarget;
+
+// Implements a gesture animation (fling scroll, etc.) using a curve with a generic interface
+// to define the animation parameters as a function of time, and applies the animation
+// to a target, again via a generic interface. It is assumed that animate() is called
+// on a more-or-less regular basis by the owner.
+class WebActiveGestureAnimation {
+    WTF_MAKE_NONCOPYABLE(WebActiveGestureAnimation);
+public:
+    static PassOwnPtr<WebActiveGestureAnimation> createAtAnimationStart(PassOwnPtr<WebGestureCurve>, WebGestureCurveTarget*);
+    static PassOwnPtr<WebActiveGestureAnimation> createWithTimeOffset(PassOwnPtr<WebGestureCurve>, WebGestureCurveTarget*, double startTime);
+    ~WebActiveGestureAnimation();
+
+    bool animate(double time);
+
+private:
+    // Assumes a valid WebGestureCurveTarget that outlives the animation.
+    WebActiveGestureAnimation(PassOwnPtr<WebGestureCurve>, WebGestureCurveTarget*, double startTime, bool waitingForFirstTick);
+
+    double m_startTime;
+    bool m_waitingForFirstTick;
+    OwnPtr<WebGestureCurve> m_curve;
+    WebGestureCurveTarget* m_target;
+};
+
+} // namespace WebKit
+
+#endif