Polish launcher tooltip visibility (2nd try).

ash/launcher/launcher.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 ASH_LAUNCHER_LAUNCHER_H_
 #define ASH_LAUNCHER_LAUNCHER_H_
 #pragma once
 
 #include "ash/ash_export.h"
 #include "ash/launcher/background_animator.h"
@@ skipping 14 matching lines @@
 namespace views {
 class View;
 class Widget;
 }
 
 namespace ash {
 
 namespace internal {
 class FocusCycler;
 class LauncherView;
+class ShelfLayoutManager;
 }
 
 class LauncherIconObserver;
 class LauncherDelegate;
 class LauncherModel;
 
 class ASH_EXPORT Launcher : public internal::BackgroundAnimatorDelegate {
  public:
-  explicit Launcher(aura::Window* window_container);
+  Launcher(aura::Window* window_container,
+           internal::ShelfLayoutManager* shelf_layout_manager);
   virtual ~Launcher();
 
   // Sets the focus cycler.  Also adds the launcher to the cycle.
   void SetFocusCycler(internal::FocusCycler* focus_cycler);
   internal::FocusCycler* GetFocusCycler();
 
   void SetAlignment(ShelfAlignment alignment);
   ShelfAlignment alignment() const { return alignment_; }
 
   // Sets whether the launcher paints a background. Default is false, but is set
@@ skipping 64 matching lines @@
 
   // Used to animate the background.
   internal::BackgroundAnimator background_animator_;
 
   DISALLOW_COPY_AND_ASSIGN(Launcher);
 };
 
 }  // namespace ash
 
 #endif  // ASH_LAUNCHER_LAUNCHER_H_