Disable ubercomp for kiosk mode.

This is a short term workaround. Will revert promptly.

BUG=342061
TEST=launch app in kiosk mode and make sure things are still working, and RenderWidget::CreateOutputSurface() does not allocate DelegatedCompositorOutputSurface.
R=xiyuan@chromium.org

Review URL: https://codereview.chromium.org/164683002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251146 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/chromeos/login/user_manager_impl.cc

@@ -1452,6 +1452,9 @@ void UserManagerImpl::KioskAppLoggedIn(const std::string& app_id) {
   command_line->AppendSwitch(::switches::kForceAppMode);
   command_line->AppendSwitchASCII(::switches::kAppId, kiosk_app_id);
 
+  // TODO(hshi): re-enable ubercomp in kiosk mode. http://crbug.com/342061
+  command_line->AppendSwitch(::switches::kDisableDelegatedRenderer);
+
   // Disable window animation since kiosk app runs in a single full screen
   // window and window animation causes start-up janks.
   command_line->AppendSwitch(