Polish launcher tooltip visibility (2nd try).

ash/launcher/launcher_view.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_VIEW_H_
 #define ASH_LAUNCHER_LAUNCHER_VIEW_H_
 #pragma once
 
 #include <utility>
 #include <vector>
@@ skipping 23 matching lines @@
 
 class LauncherDelegate;
 struct LauncherItem;
 class LauncherIconObserver;
 class LauncherModel;
 
 namespace internal {
 
 class LauncherButton;
 class LauncherTooltipManager;
+class ShelfLayoutManager;
 
 class ASH_EXPORT LauncherView : public views::View,
                                 public LauncherModelObserver,
                                 public views::ButtonListener,
                                 public LauncherButtonHost,
                                 public views::ContextMenuController,
                                 public views::FocusTraversable,
                                 public views::BoundsAnimatorObserver {
  public:
-  LauncherView(LauncherModel* model, LauncherDelegate* delegate);
+  LauncherView(LauncherModel* model,
+               LauncherDelegate* delegate,
+               ShelfLayoutManager* shelf_layout_manager);
   virtual ~LauncherView();
 
   LauncherTooltipManager* tooltip_manager() { return tooltip_.get(); }
 
   void Init();
 
   void SetAlignment(ShelfAlignment alignment);
 
   // Returns the ideal bounds of the specified item, or an empty rect if id
   // isn't know.
@@ skipping 178 matching lines @@
 
   ShelfAlignment alignment_;
 
   DISALLOW_COPY_AND_ASSIGN(LauncherView);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_LAUNCHER_LAUNCHER_VIEW_H_