Add support for a context menu on the browser shortcut icon

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 ddf4add67081a7a2b5c13a6cac5ac742ef81c406..1e1b5c23a62e018a3d9e1460e1c966a2bf6e4026 100644
--- a/ash/shell/launcher_delegate_impl.cc
+++ b/ash/shell/launcher_delegate_impl.cc
@@ -33,6 +33,10 @@ void LauncherDelegateImpl::CreateNewWindow() {
   ash::shell::ToplevelWindow::CreateToplevelWindow(create_params);
 }
 
+void LauncherDelegateImpl::CreateNewIncognitoWindow() {
+  CreateNewWindow();
+}
+
 void LauncherDelegateImpl::ItemClicked(const ash::LauncherItem& item) {
   aura::Window* window = watcher_->GetWindowByID(item.id);
   window->Show();
@@ -60,5 +64,9 @@ ash::LauncherID LauncherDelegateImpl::GetIDByWindow(aura::Window* window) {
   return watcher_->GetIDByWindow(window);
 }
 
+bool LauncherDelegateImpl::IsLoggedInAsGuest() {
+  return false;
+}
+
 }  // namespace shell
 }  // namespace ash