Define WebScrollOffsetAnimationCurve

public/platform/WebScrollOffsetAnimationCurve.h

Index: public/platform/WebScrollOffsetAnimationCurve.h
diff --git a/public/platform/WebScrollOffsetAnimationCurve.h b/public/platform/WebScrollOffsetAnimationCurve.h
new file mode 100644
index 0000000000000000000000000000000000000000..8036b60fbc5a717ca7e8eb2aacd41d21ebef6d45
--- /dev/null
+++ b/public/platform/WebScrollOffsetAnimationCurve.h
@@ -0,0 +1,25 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef WebScrollOffsetAnimationCurve_h
+#define WebScrollOffsetAnimationCurve_h
+
+#include "WebAnimationCurve.h"
+
+#include "WebFloatPoint.h"
+
+namespace blink {
+
+class WebScrollOffsetAnimationCurve : public WebAnimationCurve {
+public:
+    virtual ~WebScrollOffsetAnimationCurve() { }
+
+    virtual void setInitialValue(WebFloatPoint) = 0;
+    virtual WebFloatPoint getValue(double time) const = 0;
+    virtual double duration() const = 0;
+};
+
+} // namespace blink
+
+#endif // WebScrollOffsetAnimationCurve_h