Added a switch to let pass-through login tests skip OAuth verification part.

chrome/browser/chromeos/login/login_performer.cc

Index: chrome/browser/chromeos/login/login_performer.cc
===================================================================
--- chrome/browser/chromeos/login/login_performer.cc	(revision 95419)
+++ chrome/browser/chromeos/login/login_performer.cc	(working copy)
@@ -50,8 +50,11 @@
       screen_lock_requested_(false),
       initial_online_auth_pending_(false),
       auth_mode_(AUTH_MODE_INTERNAL),
-      using_oauth_(CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kWebUIGaiaLogin)),
+      using_oauth_(
+          CommandLine::ForCurrentProcess()->HasSwitch(
+              switches::kWebUIGaiaLogin) &&
+          !CommandLine::ForCurrentProcess()->HasSwitch(
+              switches::kSkipOAuthLogin)),
       method_factory_(this) {
   DCHECK(default_performer_ == NULL)
       << "LoginPerformer should have only one instance.";