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

chrome/browser/chromeos/login/parallel_authenticator.h

Index: chrome/browser/chromeos/login/parallel_authenticator.h
diff --git a/chrome/browser/chromeos/login/parallel_authenticator.h b/chrome/browser/chromeos/login/parallel_authenticator.h
index 46a77a7ef362edd4fdf8eab84ff49b124047bca0..ae1de806e11619385c05cb665356a4d6ad849161 100644
--- a/chrome/browser/chromeos/login/parallel_authenticator.h
+++ b/chrome/browser/chromeos/login/parallel_authenticator.h
@@ -73,8 +73,7 @@ class ParallelAuthenticator : public Authenticator,
 
   // Authenticator overrides.
   virtual void CompleteLogin(Profile* profile,
-                             const std::string& username,
-                             const std::string& password) OVERRIDE;
+                             const UserCredentials& credentials) OVERRIDE;
 
   // Given a |username| and |password|, this method attempts to authenticate to
   // the Google accounts servers and your Chrome OS device simultaneously.
@@ -102,23 +101,22 @@ class ParallelAuthenticator : public Authenticator,
   // we are asked to authenticate valid HOSTED account creds, we will
   // call OnLoginFailure() with HOSTED_NOT_ALLOWED.
   virtual void AuthenticateToLogin(Profile* profile,
-                                   const std::string& username,
-                                   const std::string& password,
+                                   const UserCredentials& credentials,
                                    const std::string& login_token,
                                    const std::string& login_captcha) OVERRIDE;
 
-  // Given a |username| and |password|, this method attempts to
-  // authenticate to the cached credentials. This will never contact
-  // the server even if it's online. The auth result is sent to
-  // LoginStatusConsumer in a same way as AuthenticateToLogin does.
-  virtual void AuthenticateToUnlock(const std::string& username,
-                                    const std::string& password) OVERRIDE;
+  // Given |credentials|, this method attempts to authenticate to the cached
+  // credentials. This will never contact the server even if it's online.
+  // The auth result is sent to LoginStatusConsumer in a same way as
+  // AuthenticateToLogin does.
+  virtual void AuthenticateToUnlock(
+      const UserCredentials& credentials) OVERRIDE;
 
   // Initiates locally managed user login.
   // Creates cryptohome if missing or mounts existing one and
   // notifies consumer on the success/failure.
-  virtual void LoginAsLocallyManagedUser(const std::string& username,
-                                         const std::string& password) OVERRIDE;
+  virtual void LoginAsLocallyManagedUser(
+      const UserCredentials& credentials) OVERRIDE;
 
   // Initiates retail mode login.
   // Mounts tmpfs and notifies consumer on the success/failure.
@@ -142,8 +140,7 @@ class ParallelAuthenticator : public Authenticator,
       const std::string& old_password) OVERRIDE;
   virtual void ResyncEncryptedData() OVERRIDE;
   virtual void RetryAuth(Profile* profile,
-                         const std::string& username,
-                         const std::string& password,
+                         const UserCredentials& credentials,
                          const std::string& login_token,
                          const std::string& login_captcha) OVERRIDE;
   // AuthAttemptStateResolver overrides.