Drag and drop between app list and launcher - First patch

ui/app_list/views/apps_grid_view.h

Index: ui/app_list/views/apps_grid_view.h
diff --git a/ui/app_list/views/apps_grid_view.h b/ui/app_list/views/apps_grid_view.h
index b91ba64102f466812f226a987f9402af5c316179..1c2517aa4c62da5ef71a2d44d586d0ef2828e3fe 100644
--- a/ui/app_list/views/apps_grid_view.h
+++ b/ui/app_list/views/apps_grid_view.h
@@ -28,6 +28,7 @@ namespace test {
 class AppsGridViewTestApi;
 }
 
+class ApplicationDnDHost;
 class AppListItemView;
 class AppsGridViewDelegate;
 class PageSwitcher;
@@ -65,15 +66,18 @@ class APP_LIST_EXPORT AppsGridView : public views::View,
   // transition, this does nothing.
   void EnsureViewVisible(const views::View* view);
 
-  void InitiateDrag(views::View* view,
+  void InitiateDrag(AppListItemView* view,
                     Pointer pointer,
                     const ui::LocatedEvent& event);
-  void UpdateDrag(views::View* view,
+  void UpdateDrag(AppListItemView* view,
                   Pointer pointer,
                   const ui::LocatedEvent& event);
   void EndDrag(bool cancel);
   bool IsDraggedView(const views::View* view) const;
 
+  // Set the drag and drop host for application links.
+  void SetAppListDnDHost(ApplicationDnDHost* dnd_host);
+
   // Prerenders the icons on and around |page_index|.
   void Prerender(int page_index);
 
@@ -157,6 +161,9 @@ class APP_LIST_EXPORT AppsGridView : public views::View,
   void CalculateDropTarget(const gfx::Point& drag_point,
                            bool use_page_button_hovering);
 
+  // Dispatch the drag and drop update event to the dnd host (if needed).
+  void DispatchDragEventToDnDHost(const ui::LocatedEvent& event);
+
   // Starts the page flip timer if |drag_point| is in left/right side page flip
   // zone or is over page switcher.
   void MaybeStartPageFlipTimer(const gfx::Point& drag_point);
@@ -202,11 +209,18 @@ class APP_LIST_EXPORT AppsGridView : public views::View,
 
   views::View* selected_view_;
 
-  views::View* drag_view_;
+  AppListItemView* drag_view_;
   gfx::Point drag_start_;
   Pointer drag_pointer_;
   Index drop_target_;
 
+  // An application target drag and drop host which accepts dnd operations.
+  ApplicationDnDHost* dnd_host_;
+
+  // The drag operation is currently inside the dnd host and events get
+  // dispatched.
+  bool dnd_host_dispatched_drag_;
+
   // Last mouse drag location in this view's coordinates.
   gfx::Point last_drag_point_;