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

chrome/browser/chromeos/login/login_display.h

Index: chrome/browser/chromeos/login/login_display.h
diff --git a/chrome/browser/chromeos/login/login_display.h b/chrome/browser/chromeos/login/login_display.h
index f37293587c691e4055984c389a2dcad287f98431..5579ccc1e429883a6340426dae55d61e55607c4f 100644
--- a/chrome/browser/chromeos/login/login_display.h
+++ b/chrome/browser/chromeos/login/login_display.h
@@ -41,18 +41,16 @@ class LoginDisplay : public RemoveUserDelegate {
     virtual void CreateLocallyManagedUser(const string16& display_name,
                                           const std::string& password) = 0;
 
-    // Complete sign process with specified |username| and |password|.
+    // Complete sign process with specified |credentials|.
     // Used for new users authenticated through an extension.
-    virtual void CompleteLogin(const std::string& username,
-                               const std::string& password) = 0;
+    virtual void CompleteLogin(const UserCredentials& credentials) = 0;
 
     // Returns name of the currently connected network.
     virtual string16 GetConnectedNetworkName() = 0;
 
     // Sign in using |username| and |password| specified.
     // Used for known users only.
-    virtual void Login(const std::string& username,
-                       const std::string& password) = 0;
+    virtual void Login(const UserCredentials& credentials) = 0;
 
     // Sign in as a retail mode user.
     virtual void LoginAsRetailModeUser() = 0;