Fix app list drag view being hidden on reparent when synchronous drag is setting up.

ui/app_list/views/apps_grid_view.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_APP_LIST_VIEWS_APPS_GRID_VIEW_H_
 #define UI_APP_LIST_VIEWS_APPS_GRID_VIEW_H_
 
 #include <set>
 #include <string>
 
@@ skipping 98 matching lines @@
   // Called from AppListItemView when it receives a drag event. Returns true
   // if the drag is still happening.
   bool UpdateDragFromItem(Pointer pointer, const ui::LocatedEvent& event);
 
   // Called when the user is dragging an app. |point| is in grid view
   // coordinates.
   void UpdateDrag(Pointer pointer, const gfx::Point& point);
   void EndDrag(bool cancel);
   bool IsDraggedView(const views::View* view) const;
   void ClearDragState(bool cancel_reparent);
+  void SetDragViewVisible(bool visible);
 
   // Set the drag and drop host for application links.
   void SetDragAndDropHostOfCurrentAppList(
       ApplicationDragAndDropHost* drag_and_drop_host);
 
   // Prerenders the icons on and around |page_index|.
   void Prerender(int page_index);
 
   bool has_dragged_view() const { return drag_view_ != NULL; }
   bool dragging() const { return drag_pointer_ != NONE; }
@@ skipping 409 matching lines @@
 
   // True if the drag_view_ item is a folder item being dragged for reparenting.
   bool dragging_for_reparent_item_;
 
   DISALLOW_COPY_AND_ASSIGN(AppsGridView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_APPS_GRID_VIEW_H_