First Implementation of Snapped Points

cc/input/input_handler.h

 // Copyright 2011 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 CC_INPUT_INPUT_HANDLER_H_
 #define CC_INPUT_INPUT_HANDLER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 136 matching lines @@
   // room to move the layer in the requested direction, its first ancestor layer
   // that can be scrolled will be moved instead. The return value's |did_scroll|
   // field is set to false if no layer can be moved in the requested direction
   // at all, and set to true if any layer is moved. If the scroll delta hits the
   // root layer, and the layer can no longer move, the root overscroll
   // accumulated within this ScrollBegin() scope is reported in the return
   // value's |accumulated_overscroll| field. Should only be called if
   // ScrollBegin() returned SCROLL_STARTED.
   virtual InputHandlerScrollResult ScrollBy(ScrollState* scroll_state) = 0;
 
+  virtual void SnapAfterGestureScroll(const gfx::Point&) = 0;
+
+  virtual void FindSnappedOffset(gfx::Vector2dF* snapped_offset,
+                                 const gfx::Vector2dF& original_offset) = 0;
+
   // Returns SCROLL_STARTED if a layer was actively being scrolled,
   // SCROLL_IGNORED if not.
   virtual ScrollStatus FlingScrollBegin() = 0;
 
   virtual void MouseMoveAt(const gfx::Point& mouse_position) = 0;
   virtual void MouseDown() = 0;
   virtual void MouseUp() = 0;
   virtual void MouseLeave() = 0;
 
   // Stop scrolling the selected layer. Should only be called if ScrollBegin()
@@ skipping 57 matching lines @@
   InputHandler() {}
   virtual ~InputHandler() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InputHandler);
 };
 
 }  // namespace cc
 
 #endif  // CC_INPUT_INPUT_HANDLER_H_