cros: Fix mouse over-scroll animation not happening.

ui/app_list/pagination_model.h

Index: ui/app_list/pagination_model.h
diff --git a/ui/app_list/pagination_model.h b/ui/app_list/pagination_model.h
index 70262948c064bc0ec31993d60de69812e4b54698..d51241afca352f5dd1a6b9c6b157be60f1b839f9 100644
--- a/ui/app_list/pagination_model.h
+++ b/ui/app_list/pagination_model.h
@@ -74,13 +74,15 @@ class APP_LIST_EXPORT PaginationModel : public ui::AnimationDelegate {
   // reverses it.
   void EndScroll(bool cancel);
 
+  // Returns true if current transition is being reverted.
+  bool IsRevertingCurrentTransition() const;
+
   void AddObserver(PaginationModelObserver* observer);
   void RemoveObserver(PaginationModelObserver* observer);
 
   int total_pages() const { return total_pages_; }
   int selected_page() const { return selected_page_; }
   const Transition& transition() const { return transition_; }
-  bool scrolling() const { return scrolling_; }
 
   bool is_valid_page(int page) const {
     return page >= 0 && page < total_pages_;
@@ -119,8 +121,6 @@ class APP_LIST_EXPORT PaginationModel : public ui::AnimationDelegate {
 
   Transition transition_;
 
-  bool scrolling_;  // Whether a scroll is in progress.
-
   // Pending selected page when SelectedPage is called during a transition. If
   // multiple SelectPage is called while a transition is in progress, only the
   // last target page is remembered here.