Move fling implementation from renderer to browser:

content/browser/renderer_host/input/fling/fling_curve_configuration.h

+// Copyright (c) 2013 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_BROWSER_RENDERER_HOST_INPUT_FLING_FLING_CURVE_CONFIGURATION_H_
+#define CONTENT_BROWSER_RENDERER_HOST_INPUT_FLING_FLING_CURVE_CONFIGURATION_H_
+
+#include <vector>
+
+#include "base/synchronization/lock.h"
+#include "ui/gfx/point.h"
+#include "ui/gfx/point_f.h"
+
+namespace content {
+
+class FlingCurve;
+
+// A class to manage dynamically adjustable parameters controlling the
+// shape of the fling deacceleration function.
+class FlingCurveConfiguration {
+ public:
+  FlingCurveConfiguration();
+  virtual ~FlingCurveConfiguration();
+
+  // Create a touchpad fling curve using the current parameters.
+  FlingCurve* CreateForTouchPad(const gfx::PointF& velocity,
+                                const gfx::Point& cumulative_scroll);
+
+  // Create a touchscreen fling curve using the current parameters.
+  FlingCurve* CreateForTouchScreen(const gfx::PointF& velocity,
+                                   const gfx::Point& cumulative_scroll);
+
+  // Set the curve parameters.
+  void SetCurveParameters(const std::vector<float>& new_touchpad,
+                          const std::vector<float>& new_touchscreen);
+
+ private:
+  FlingCurve* CreateCore(const std::vector<float>& coefs,
+                         const gfx::PointF& velocity,
+                         const gfx::Point& cumulative_scroll);
+
+  // Protect access to touchpad_coefs_ and touchscreen_coefs_.
+  base::Lock lock_;
+  std::vector<float> touchpad_coefs_;
+  std::vector<float> touchscreen_coefs_;
+
+  DISALLOW_COPY_AND_ASSIGN(FlingCurveConfiguration);
+};
+
+} // namespace content
+
+#endif // CONTENT_BROWSER_RENDERER_HOST_INPUT_FLING_FLING_CURVE_CONFIGURATION_H_