Refactor TouchSelectionDraggableClient APIs

ui/touch_selection/touch_selection_draggable.h

Index: ui/touch_selection/touch_selection_draggable.h
diff --git a/ui/touch_selection/touch_selection_draggable.h b/ui/touch_selection/touch_selection_draggable.h
index 0bd9a70f8849fc0a245adac8eb8b327cb55bfeb9..972a22c80d2b9591fb93d19f67c3b0801a9f38d4 100644
--- a/ui/touch_selection/touch_selection_draggable.h
+++ b/ui/touch_selection/touch_selection_draggable.h
@@ -13,15 +13,19 @@ namespace ui {
 class MotionEvent;
 class TouchSelectionDraggable;
 
+enum TouchHandleDragEvent {
+  HANDLE_DRAG_BEGIN,
+  HANDLE_DRAG_UPDATE,
+  HANDLE_DRAG_END
+};
+
 // Interface through which TouchSelectionDraggable manipulates the selection.
 class UI_TOUCH_SELECTION_EXPORT TouchSelectionDraggableClient {
  public:
   virtual ~TouchSelectionDraggableClient() {}
-  virtual void OnDragBegin(const TouchSelectionDraggable& draggable,
+  virtual void OnDragEvent(const TouchHandleDragEvent event,
+                           const TouchSelectionDraggable& draggable,
                            const gfx::PointF& start_position) = 0;
-  virtual void OnDragUpdate(const TouchSelectionDraggable& draggable,
-                            const gfx::PointF& new_position) = 0;
-  virtual void OnDragEnd(const TouchSelectionDraggable& draggable) = 0;
   virtual bool IsWithinTapSlop(const gfx::Vector2dF& delta) const = 0;
 };