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

chrome/browser/chromeos/login/user.h

Index: chrome/browser/chromeos/login/user.h
diff --git a/chrome/browser/chromeos/login/user.h b/chrome/browser/chromeos/login/user.h
index 90bb9d52de94cc7462a973c3baad04054f12c7e6..17e5cfe25910a40dad541a6f285cee74c5effb68 100644
--- a/chrome/browser/chromeos/login/user.h
+++ b/chrome/browser/chromeos/login/user.h
@@ -24,6 +24,19 @@ extern const char kRetailModeUserEMail[];
 
 extern const int kDefaultImagesCount;
 
+// User credentials data that is being exchanged between part of ChromeOS
+// authentication mechanism.
+struct UserCredentials {
+  UserCredentials();
+  UserCredentials(const std::string& username,
+                  const std::string& password,
+                  const std::string& auth_code);
+  bool operator==(const UserCredentials& cred) const;
+  std::string username;
+  std::string password;
+  std::string auth_code;
+};
+
 // A class representing information about a previously logged in user.
 // Each user has a canonical email (username), returned by |email()| and
 // may have a different displayed email (in the raw form as entered by user),