Consolidate content fling implementations

content/child/fling_animator_impl_android.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_FLING_ANIMATOR_IMPL_ANDROID_H_
-#define CONTENT_CHILD_FLING_ANIMATOR_IMPL_ANDROID_H_
-
-
-#include "third_party/WebKit/public/platform/WebFloatPoint.h"
-#include "third_party/WebKit/public/platform/WebGestureCurve.h"
-#include "third_party/WebKit/public/platform/WebSize.h"
-#include "ui/gfx/android/scroller.h"
-#include "ui/gfx/point_f.h"
-
-namespace blink {
-class WebGestureCurveTarget;
-}
-
-namespace content {
-
-class FlingAnimatorImpl : public blink::WebGestureCurve {
- public:
-  FlingAnimatorImpl();
-  virtual ~FlingAnimatorImpl();
-
-  static FlingAnimatorImpl* CreateAndroidGestureCurve(
-      const blink::WebFloatPoint& velocity,
-      const blink::WebSize&);
-
-  virtual bool apply(double time, blink::WebGestureCurveTarget* target);
-
- private:
-  void StartFling(const gfx::PointF& velocity);
-  void CancelFling();
-
-  bool is_active_;
-
-  gfx::Scroller scroller_;
-
-  gfx::PointF last_position_;
-
-  DISALLOW_COPY_AND_ASSIGN(FlingAnimatorImpl);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_CHILD_FLING_ANIMATOR_IMPL_ANDROID_H_