Drag and drop between app list and launcher - First patch

ash/shell.h

Index: ash/shell.h
diff --git a/ash/shell.h b/ash/shell.h
index b8a0ce9b1dee96615b1ae16c1e560928794ddbeb..cb96ee64a51650444efbfeb4e95f4e5ff0b70fd7 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -26,6 +26,9 @@
 
 class CommandLine;
 
+namespace app_list {
+class ApplicationDragAndDropHost;
+}
 namespace aura {
 class EventFilter;
 class RootWindow;
@@ -217,6 +220,11 @@ class ASH_EXPORT Shell
   // will be used.
   void ToggleAppList(aura::Window* anchor);
 
+  // If |drag_and_drop_host| is not NULL it will be called upon drag and drop
+  // operations outside the application list.
+  void SetDragAndDropHostOfCurrentAppList(
+      app_list::ApplicationDragAndDropHost* drag_and_drop_host);
+
   // Returns app list target visibility.
   bool GetAppListTargetVisibility() const;