[NOT FOR REVIEW] Patch demonstrating the changes required for browser side fling.

webkit/child/touch_fling_gesture_curve.h

-// Copyright (c) 2012 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 WEBKIT_CHILD_TOUCH_FLING_GESTURE_CURVE_H_
-#define WEBKIT_CHILD_TOUCH_FLING_GESTURE_CURVE_H_
-
-#include "third_party/WebKit/public/platform/WebFloatPoint.h"
-#include "third_party/WebKit/public/platform/WebFloatSize.h"
-#include "third_party/WebKit/public/platform/WebGestureCurve.h"
-#include "third_party/WebKit/public/platform/WebSize.h"
-#include "webkit/child/webkit_child_export.h"
-
-namespace WebKit {
-class WebGestureCurveTarget;
-}
-
-namespace webkit_glue {
-
-// Implementation of WebGestureCurve suitable for touch pad/screen-based
-// fling scroll. Starts with a flat velocity profile based on 'velocity', which
-// tails off to zero. Time is scaled to that duration of the fling is
-// proportional to the initial velocity.
-class TouchFlingGestureCurve : public WebKit::WebGestureCurve {
- public:
-
-  WEBKIT_CHILD_EXPORT static WebGestureCurve* Create(
-      const WebKit::WebFloatPoint& initial_velocity,
-      float p0, float p1, float p2,
-      const WebKit::WebSize& cumulativeScroll);
-
- virtual bool apply(double monotonicTime,
-                    WebKit::WebGestureCurveTarget*) OVERRIDE;
-
- private:
-  TouchFlingGestureCurve(const WebKit::WebFloatPoint& initial_velocity,
-                         float p0,
-                         float p1,
-                         float p2,
-                         const WebKit::WebSize& cumulativeScroll);
-  virtual ~TouchFlingGestureCurve();
-
-  WebKit::WebFloatPoint displacement_ratio_;
-  WebKit::WebFloatSize cumulative_scroll_;
-  float coefficients_[3];
-  float time_offset_;
-  float curve_duration_;
-  float position_offset_;
-
-  DISALLOW_COPY_AND_ASSIGN(TouchFlingGestureCurve);
-};
-
-} // namespace webkit_glue
-
-#endif // WEBKIT_CHILD_TOUCH_FLING_GESTURE_CURVE_H_