Refactor TouchSelectionDraggableClient APIs

ui/touch_selection/touch_selection_controller.h

Index: ui/touch_selection/touch_selection_controller.h
diff --git a/ui/touch_selection/touch_selection_controller.h b/ui/touch_selection/touch_selection_controller.h
index 797b7556444b46046c8f6b48908d4b8aae1af283..3a5b83e20065b537003a6ee28f9f0fe76b211ab4 100644
--- a/ui/touch_selection/touch_selection_controller.h
+++ b/ui/touch_selection/touch_selection_controller.h
@@ -146,11 +146,9 @@ class UI_TOUCH_SELECTION_EXPORT TouchSelectionController
   enum InputEventType { TAP, REPEATED_TAP, LONG_PRESS, INPUT_EVENT_TYPE_NONE };
 
   // TouchHandleClient implementation.
-  void OnDragBegin(const TouchSelectionDraggable& draggable,
-                   const gfx::PointF& drag_position) override;
-  void OnDragUpdate(const TouchSelectionDraggable& draggable,
-                    const gfx::PointF& drag_position) override;
-  void OnDragEnd(const TouchSelectionDraggable& draggable) override;
+  void OnDragEvent(const TouchHandleDragEvent event,
+                   const TouchSelectionDraggable& draggable,
+                   const gfx::PointF& start_position) override;
   bool IsWithinTapSlop(const gfx::Vector2dF& delta) const override;
   void OnHandleTapped(const TouchHandle& handle) override;
   void SetNeedsAnimate() override;
@@ -158,6 +156,12 @@ class UI_TOUCH_SELECTION_EXPORT TouchSelectionController
   base::TimeDelta GetMaxTapDuration() const override;
   bool IsAdaptiveHandleOrientationEnabled() const override;
 
+  void HandleDragBegin(const TouchSelectionDraggable& draggable,
+                       const gfx::PointF& drag_position);
+  void HandleDragUpdate(const TouchSelectionDraggable& draggable,
+                        const gfx::PointF& drag_position);
+  void HandleDragEnd(const TouchSelectionDraggable& draggable);
+
   // LongPressDragSelectorClient implementation.
   void OnLongPressDragActiveStateChanged() override;
   gfx::PointF GetSelectionStart() const override;