First Implementation of Snapped Points

ui/events/android/scroller.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 UI_EVENTS_ANDROID_SCROLLER_H_
 #define UI_EVENTS_ANDROID_SCROLLER_H_
 
 #include "base/time/time.h"
 #include "ui/events/events_base_export.h"
 #include "ui/events/gesture_curve.h"
@@ skipping 17 matching lines @@
   };
 
   explicit Scroller(const Config& config);
   ~Scroller() override;
 
   // GestureCurve implementation.
   bool ComputeScrollOffset(base::TimeTicks time,
                            gfx::Vector2dF* offset,
                            gfx::Vector2dF* velocity) override;
 
+  void ComputeTotalScrollOffset(gfx::Vector2dF& offset) override;
+
+  bool ResetCurveBySnappedOffset(const gfx::Vector2dF& offset) override;
+
   // Start scrolling by providing a starting point and the distance to travel.
   // The default value of 250 milliseconds will be used for the duration.
   void StartScroll(float start_x,
                    float start_y,
                    float dx,
                    float dy,
                    base::TimeTicks start_time);
 
   // Start scrolling by providing a starting point, the distance to travel,
   // and the duration of the scroll.
@@ skipping 56 matching lines @@
     SCROLL_MODE,
     FLING_MODE,
   };
 
   bool ComputeScrollOffsetInternal(base::TimeTicks time);
   void RecomputeDeltas();
 
   double GetSplineDeceleration(float velocity) const;
   base::TimeDelta GetSplineFlingDuration(float velocity) const;
   double GetSplineFlingDistance(float velocity) const;
+  double GetSplineVelocityFromDeceleration(float deceleration) const;
+  double GetSplineVelocityFromDistance(float distance) const;
 
   Mode mode_;
 
   float start_x_;
   float start_y_;
   float final_x_;
   float final_y_;
 
   float min_x_;
   float max_x_;
@@ skipping 18 matching lines @@
   float distance_;
 
   float fling_friction_;
   float deceleration_;
   float tuning_coeff_;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_ANDROID_SCROLLER_H_