Polish launcher tooltip visibility (2nd try).

ash/launcher/launcher_view.cc

Index: ash/launcher/launcher_view.cc
diff --git a/ash/launcher/launcher_view.cc b/ash/launcher/launcher_view.cc
index 65955d21f2afa9cc60e099c27580df83567e701c..94c4a822512eeea9585cec1c4a1c5b87e4794bf4 100644
--- a/ash/launcher/launcher_view.cc
+++ b/ash/launcher/launcher_view.cc
@@ -261,7 +261,9 @@ class LauncherView::StartFadeAnimationDelegate
   DISALLOW_COPY_AND_ASSIGN(StartFadeAnimationDelegate);
 };
 
-LauncherView::LauncherView(LauncherModel* model, LauncherDelegate* delegate)
+LauncherView::LauncherView(LauncherModel* model,
+                           LauncherDelegate* delegate,
+                           ShelfLayoutManager* shelf_layout_manager)
     : model_(model),
       delegate_(delegate),
       view_model_(new views::ViewModel),
@@ -278,7 +280,7 @@ LauncherView::LauncherView(LauncherModel* model, LauncherDelegate* delegate)
   bounds_animator_->AddObserver(this);
   set_context_menu_controller(this);
   focus_search_.reset(new LauncherFocusSearch(view_model_.get()));
-  tooltip_.reset(new LauncherTooltipManager(alignment_));
+  tooltip_.reset(new LauncherTooltipManager(alignment_, shelf_layout_manager));
 }
 
 LauncherView::~LauncherView() {