Implement oauth token external handler checking.

components/user_manager/user_manager.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 COMPONENTS_USER_MANAGER_USER_MANAGER_H_
 #define COMPONENTS_USER_MANAGER_USER_MANAGER_H_
 
 #include <string>
 
 #include "components/user_manager/user.h"
+#include "components/user_manager/user_id.h"
 #include "components/user_manager/user_manager_export.h"
 #include "components/user_manager/user_type.h"
 
+namespace base {
+class DictionaryValue;
+}
+
 namespace chromeos {
 class ScopedUserManagerEnabler;
 }
 
 namespace user_manager {
 
 class RemoveUserDelegate;
 
 // Interface for UserManagerBase - that provides base implementation for
 // Chrome OS user management. Typical features:
@@ skipping 275 matching lines @@
 
   virtual void NotifyLocalStateChanged() = 0;
 
   // Changes the child status and notifies observers.
   virtual void ChangeUserChildStatus(User* user, bool is_child) = 0;
 
 
   // Returns true if supervised users allowed.
   virtual bool AreSupervisedUsersAllowed() const = 0;
 
+  // Methods for storage/retrieval of per-user properties in Local State.
+
+  // Performs a lookup of properties associated with |user_id|. If found,
+  // returns |true| and fills |out_value|. |out_value| can be NULL, if
+  // only existence check is required.
+  virtual bool FindKnownUserPrefs(const UserID& user_id,
+                                  const base::DictionaryValue** out_value) = 0;
+
+  // Updates (or creates) properties associated with |user_id| based
+  // on |values|. |clear| defines if existing properties are cleared (|true|)
+  // or if it is just a incremental update (|false|).
+  virtual void UpdateKnownUserPrefs(const UserID& user_id,
+                                    const base::DictionaryValue& values,
+                                    bool clear) = 0;
+
  protected:
   // Sets UserManager instance.
   static void SetInstance(UserManager* user_manager);
 
   // Pointer to the existing UserManager instance (if any).
   // Usually is set by calling Initialize(), reset by calling Destroy().
   // Not owned since specific implementation of UserManager should decide on its
   // own appropriate owner. For src/chrome implementation such place is
   // g_browser_process->platform_part().
   static UserManager* instance;
 
  private:
   friend class chromeos::ScopedUserManagerEnabler;
 
   // Same as Get() but doesn't won't crash is current instance is NULL.
   static UserManager* GetForTesting();
 
   // Sets UserManager instance to the given |user_manager|.
   // Returns the previous value of the instance.
   static UserManager* SetForTesting(UserManager* user_manager);
 };
 
 }  // namespace user_manager
 
 #endif  // COMPONENTS_USER_MANAGER_USER_MANAGER_H_