Polish launcher tooltip visibility (2nd try).

ash/launcher/launcher.cc

Index: ash/launcher/launcher.cc
diff --git a/ash/launcher/launcher.cc b/ash/launcher/launcher.cc
index f8314bc3cac2767d2c5ed1d3dc7b1319c1fff1ea..bc879e7cb8f01664641280f40ccfecf6145c5fe9 100644
--- a/ash/launcher/launcher.cc
+++ b/ash/launcher/launcher.cc
@@ -95,7 +95,8 @@ void Launcher::DelegateView::Layout() {
 
 // Launcher --------------------------------------------------------------------
 
-Launcher::Launcher(aura::Window* window_container)
+Launcher::Launcher(aura::Window* window_container,
+                   internal::ShelfLayoutManager* shelf_layout_manager)
     : widget_(NULL),
       window_container_(window_container),
       delegate_view_(NULL),
@@ -119,7 +120,8 @@ Launcher::Launcher(aura::Window* window_container)
   params.parent = Shell::GetContainer(
       window_container_->GetRootWindow(),
       ash::internal::kShellWindowId_LauncherContainer);
-  launcher_view_ = new internal::LauncherView(model_.get(), delegate_.get());
+  launcher_view_ = new internal::LauncherView(
+      model_.get(), delegate_.get(), shelf_layout_manager);
   launcher_view_->Init();
   delegate_view_ = new DelegateView(this);
   delegate_view_->AddChildView(launcher_view_);