Support for auth code based authentication flow for both app and web UI driven flow.

chrome/browser/chromeos/login/login_utils.h

Index: chrome/browser/chromeos/login/login_utils.h
diff --git a/chrome/browser/chromeos/login/login_utils.h b/chrome/browser/chromeos/login/login_utils.h
index daf8188f8d1803063ce37645a2b74d7e7f673b51..bbc8f83bc5fbfd7946f9414df1551df91afb1995 100644
--- a/chrome/browser/chromeos/login/login_utils.h
+++ b/chrome/browser/chromeos/login/login_utils.h
@@ -20,6 +20,7 @@ namespace chromeos {
 class Authenticator;
 class LoginDisplayHost;
 class LoginStatusConsumer;
+struct UserCredentials;
 
 class LoginUtils {
  public:
@@ -64,9 +65,8 @@ class LoginUtils {
   // this value, shown in UI.
   // Also see DelegateDeleted method.
   virtual void PrepareProfile(
-      const std::string& username,
+      const UserCredentials& credentials,
       const std::string& display_email,
-      const std::string& password,
       bool using_oauth,
       bool has_cookies,
       Delegate* delegate) = 0;