cros: Fix mouse over-scroll animation not happening.

ui/app_list/pagination_model.cc

Index: ui/app_list/pagination_model.cc
diff --git a/ui/app_list/pagination_model.cc b/ui/app_list/pagination_model.cc
index e05896c4eb0cc6e525771ae4a8258535060a14d0..12ebbb7af78126de3aff2cd033a4faed9bb9de58 100644
--- a/ui/app_list/pagination_model.cc
+++ b/ui/app_list/pagination_model.cc
@@ -15,7 +15,6 @@ PaginationModel::PaginationModel()
     : total_pages_(-1),
       selected_page_(-1),
       transition_(-1, 0),
-      scrolling_(false),
       pending_selected_page_(-1),
       transition_duration_ms_(0) {
 }
@@ -101,7 +100,6 @@ void PaginationModel::SetTransitionDuration(int duration_ms) {
 }
 
 void PaginationModel::StartScroll() {
-  scrolling_ = true;
   // Cancels current transition animation (if any).
   transition_animation_.reset();
 }
@@ -133,8 +131,6 @@ void PaginationModel::UpdateScroll(double delta) {
 }
 
 void PaginationModel::EndScroll(bool cancel) {
-  scrolling_ = false;
-
   if (!has_transition())
     return;
 
@@ -147,6 +143,10 @@ void PaginationModel::EndScroll(bool cancel) {
     transition_animation_->Hide();
 }
 
+bool PaginationModel::IsRevertingCurrentTransition() const {
+  return transition_animation_.get() && transition_animation_->IsClosing();
+}
+
 void PaginationModel::AddObserver(PaginationModelObserver* observer) {
   observers_.AddObserver(observer);
 }