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

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h

Index: chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
diff --git a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
index 1e138ff5e5c97feb7928f2b9d5d0f73333cbad91..bb05f6f58dbe40de1d5772d1917b6e77f7e8d64f 100644
--- a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
+++ b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
@@ -38,6 +38,7 @@ class CaptivePortalWindowProxy;
 class ErrorScreenActor;
 class NativeWindowDelegate;
 class User;
+struct UserCredentials;
 
 // An interface for WebUILoginDisplay to call SigninScreenHandler.
 class LoginDisplayWebUIHandler {
@@ -75,13 +76,11 @@ class SigninScreenHandlerDelegate {
 
   // Confirms sign up by provided |username| and |password| specified.
   // Used for new user login via GAIA extension.
-  virtual void CompleteLogin(const std::string& username,
-                             const std::string& password) = 0;
+  virtual void CompleteLogin(const UserCredentials& credentials) = 0;
 
   // Sign in using |username| and |password| specified.
   // Used for both known and new users.
-  virtual void Login(const std::string& username,
-                     const std::string& password) = 0;
+  virtual void Login(const UserCredentials& credentials) = 0;
 
   // Sign in into a retail mode session.
   virtual void LoginAsRetailModeUser() = 0;
@@ -280,6 +279,7 @@ class SigninScreenHandler
   void UpdateAddButtonStatus();
 
   // WebUI message handlers.
+  void HandleCompleteAuthentication(const base::ListValue* args);
   void HandleCompleteLogin(const base::ListValue* args);
   void HandleGetUsers(const base::ListValue* args);
   void HandleAuthenticateUser(const base::ListValue* args);