Implement new password separated sign in flow for chrome desktop.

chrome/browser/ui/webui/signin/inline_login_handler_impl.h

Index: chrome/browser/ui/webui/signin/inline_login_handler_impl.h
diff --git a/chrome/browser/ui/webui/signin/inline_login_handler_impl.h b/chrome/browser/ui/webui/signin/inline_login_handler_impl.h
index ddb6894aafaa7a2781482814de5fe00b9b5d6458..ba4cf76ffd96b4e3ab5507700346f6fcc606b3d3 100644
--- a/chrome/browser/ui/webui/signin/inline_login_handler_impl.h
+++ b/chrome/browser/ui/webui/signin/inline_login_handler_impl.h
@@ -74,6 +74,7 @@ class InlineLoginHandlerImpl : public InlineLoginHandler,
                               const std::string& gaia_id,
                               const std::string& password,
                               const std::string& session_index,
+                              const std::string& auth_code,
                               bool choose_what_to_sync);
     ~FinishCompleteLoginParams();
 
@@ -95,8 +96,12 @@ class InlineLoginHandlerImpl : public InlineLoginHandler,
     std::string gaia_id;
     // Password of the account used to sign in.
     std::string password;
-    // Index within gaia cookie of the account used to sign in.
+    // Index within gaia cookie of the account used to sign in.  Used only
+    // with old gaia flow.
     std::string session_index;
+    // Authentication code used to exchange for a login scoped refresh token
+    // for the account used to sign in.  Used only with new gaia flow.
+    std::string auth_code;
     // True if the user wants to configure sync before signing in.
     bool choose_what_to_sync;
   };