Add tooltip text for chrome shortcut

ash/shell/launcher_delegate_impl.cc

Index: ash/shell/launcher_delegate_impl.cc
diff --git a/ash/shell/launcher_delegate_impl.cc b/ash/shell/launcher_delegate_impl.cc
index 91ec431bec5f55cd2ed726d4a4fcde534ba72a27..f5933b1d85f5893aeea56f9eaae28d1dd27a7767 100644
--- a/ash/shell/launcher_delegate_impl.cc
+++ b/ash/shell/launcher_delegate_impl.cc
@@ -20,7 +20,12 @@ LauncherDelegateImpl::LauncherDelegateImpl(WindowWatcher* watcher)
 LauncherDelegateImpl::~LauncherDelegateImpl() {
 }
 
+// In the shell we'll create a window all the time.
 void LauncherDelegateImpl::CreateNewTab() {
+  CreateNewWindow();
+}
+
+void LauncherDelegateImpl::CreateNewWindow() {
   ash::shell::ToplevelWindow::CreateParams create_params;
   create_params.can_resize = true;
   create_params.can_maximize = true;