Consistent fading behavior for touch editing handles

ui/base/touch/touch_editing_controller.h

Index: ui/base/touch/touch_editing_controller.h
diff --git a/ui/base/touch/touch_editing_controller.h b/ui/base/touch/touch_editing_controller.h
index a48a045fc26c7babe47b51c59293ca9ccde4d93c..8be931720f29243978ba608543d02ed71f6bc1cf 100644
--- a/ui/base/touch/touch_editing_controller.h
+++ b/ui/base/touch/touch_editing_controller.h
@@ -74,6 +74,10 @@ class UI_BASE_EXPORT TouchSelectionController {
 
   // Returns true if the user is currently dragging one of the handles.
   virtual bool IsHandleDragInProgress() = 0;
+
+  // Hides visible handles. According to the value of |quick|, handles might
+  // fade out quickly or slowly.
+  virtual void HideHandles(bool quick) = 0;
 };
 
 class UI_BASE_EXPORT TouchSelectionControllerFactory {