Consolidate content fling implementations

content/child/touch_fling_gesture_curve.h

-// 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 CONTENT_CHILD_TOUCH_FLING_GESTURE_CURVE_H_
-#define CONTENT_CHILD_TOUCH_FLING_GESTURE_CURVE_H_
-
-#include "content/common/content_export.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"
-
-namespace blink {
-class WebGestureCurveTarget;
-}
-
-namespace content {
-
-// 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 blink::WebGestureCurve {
- public:
-
-  static CONTENT_EXPORT WebGestureCurve* Create(
-      const blink::WebFloatPoint& initial_velocity,
-      const blink::WebSize& cumulativeScroll);
-
- virtual bool apply(double monotonicTime,
-                    blink::WebGestureCurveTarget*) override;
-
- private:
-  TouchFlingGestureCurve(const blink::WebFloatPoint& initial_velocity,
-                         const blink::WebSize& cumulativeScroll);
-  virtual ~TouchFlingGestureCurve();
-
-  blink::WebFloatPoint displacement_ratio_;
-  blink::WebFloatSize cumulative_scroll_;
-  float time_offset_;
-  float curve_duration_;
-  float position_offset_;
-
-  DISALLOW_COPY_AND_ASSIGN(TouchFlingGestureCurve);
-};
-
-} // namespace content
-
-#endif // CONTENT_CHILD_TOUCH_FLING_GESTURE_CURVE_H_