[Easy signin] Wire up userClick auth attempt to easy unlock app and back

chromeos/login/auth/user_context.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROMEOS_LOGIN_AUTH_USER_CONTEXT_H_
 #define CHROMEOS_LOGIN_AUTH_USER_CONTEXT_H_
 
 #include <string>
 
 #include "chromeos/chromeos_export.h"
 #include "chromeos/login/auth/key.h"
 #include "components/user_manager/user_type.h"
 
 namespace chromeos {
 
 // Information that is passed around while authentication is in progress. The
 // credentials may consist of a |user_id_|, |key_| pair or a GAIA |auth_code_|.
 // The |user_id_hash_| is used to locate the user's home directory
 // mount point for the user. It is set when the mount has been completed.
 class CHROMEOS_EXPORT UserContext {
  public:
   // The authentication flow used during sign-in.
   enum AuthFlow {
     // Online authentication against GAIA. GAIA did not redirect to a SAML IdP.
     AUTH_FLOW_GAIA_WITHOUT_SAML,
     // Online authentication against GAIA. GAIA redirected to a SAML IdP.
     AUTH_FLOW_GAIA_WITH_SAML,
     // Offline authentication against a cached key.
-    AUTH_FLOW_OFFLINE
+    AUTH_FLOW_OFFLINE,
+    // Offline authentication using and Easy unlock device (e.g. a phone).
+    AUTH_FLOW_EASY_UNLOCK
   };
 
   UserContext();
   UserContext(const UserContext& other);
   explicit UserContext(const std::string& user_id);
   UserContext(user_manager::UserType user_type, const std::string& user_id);
   ~UserContext();
 
   bool operator==(const UserContext& context) const;
   bool operator!=(const UserContext& context) const;
@@ skipping 31 matching lines @@
   bool is_using_oauth_;
   AuthFlow auth_flow_;
   user_manager::UserType user_type_;
   std::string public_session_locale_;
   std::string public_session_input_method_;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_LOGIN_AUTH_USER_CONTEXT_H_