Move the panel to the root window where the mouse click occurred.

ash/launcher/launcher_util.h

Index: ash/launcher/launcher_util.h
diff --git a/ash/launcher/launcher_util.h b/ash/launcher/launcher_util.h
index 89551f064abdc76900d65593cdd9864112e7eea0..7cdd1f283e25599af5361c08368021e05427fc71 100644
--- a/ash/launcher/launcher_util.h
+++ b/ash/launcher/launcher_util.h
@@ -7,6 +7,14 @@
 
 #include "ash/ash_export.h"
 
+namespace aura {
+class Window;
+}
+
+namespace ui {
+class Event;
+}
+
 namespace ash {
 class LauncherModel;
 
@@ -15,6 +23,12 @@ namespace launcher {
 // Return the index of the browser item from a given |launcher_model|.
 ASH_EXPORT int GetBrowserItemIndex(const LauncherModel& launcher_model);
 
+// Move the |maybe_panel| to the root window where the |event| occured if
+// |maybe_panel| is of aura::client::WINDOW_TYPE_PANEL and it's not
+// in the same root window.
+ASH_EXPORT void MoveToEventRootIfPanel(aura::Window* maybe_panel,
+                                       const ui::Event& event);
+
 }  // namespace launcher
 }  // namespace ash