Layout panels on top of their launcher icons

ash/launcher/launcher.h

Index: ash/launcher/launcher.h
diff --git a/ash/launcher/launcher.h b/ash/launcher/launcher.h
index ebc56b8353409fe7cb407718621c1dc0537055d0..7955b07f53d381e09a133fd8ac929bc49e696a72 100644
--- a/ash/launcher/launcher.h
+++ b/ash/launcher/launcher.h
@@ -30,6 +30,7 @@ class FocusCycler;
 class LauncherView;
 }
 
+class LauncherIconObserver;
 class LauncherDelegate;
 class LauncherModel;
 
@@ -56,6 +57,9 @@ class ASH_EXPORT Launcher : public internal::BackgroundAnimatorDelegate {
   // no item for the specified window an empty rect is returned.
   gfx::Rect GetScreenBoundsOfItemIconForWindow(aura::Window* window);
 
+  void AddIconObserver(LauncherIconObserver* observer);
+  void RemoveIconObserver(LauncherIconObserver* observer);
+
   // Returns true if the Launcher is showing a context menu.
   bool IsShowingMenu() const;