Add a hook for capturing a user profile photo and saving it to file and local state.

chrome/browser/chromeos/login/user_manager.h

 // Copyright (c) 2011 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 CHROME_BROWSER_CHROMEOS_LOGIN_USER_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_USER_MANAGER_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/hash_tables.h"
 #include "base/memory/ref_counted.h"
+#include "base/observer_list.h"
 #include "base/synchronization/lock.h"
 #include "chrome/browser/chromeos/login/user_image_loader.h"
 #include "content/common/notification_observer.h"
 #include "content/common/notification_registrar.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
 class FilePath;
 class PrefService;
 
 namespace base {
@@ skipping 130 matching lines @@
   // Accessor for current_user_is_new_.
   bool current_user_is_new() const {
     return current_user_is_new_;
   }
 
   bool user_is_logged_in() const { return user_is_logged_in_; }
 
   // Returns true if we're logged in as a Guest.
   bool IsLoggedInAsGuest() const;
 
+  // Interface that observers of UserManager must implement in order
+  // to receive notification when local state preferences is changed
+  class Observer {
+   public:
+    // Called when the local state preferences is changed
+    virtual void LocalStateChanged(UserManager* user_manager) = 0;
+
+   protected:
+    virtual ~Observer() {}
+  };
+
+  void AddObserver(Observer* obs);
+  void RemoveObserver(Observer* obs);
+
+  void NotifyLocalStateChanged();
+
  protected:
   UserManager();
   virtual ~UserManager();
 
   // Returns image filepath for the given user.
   FilePath GetImagePathForUser(const std::string& username);
 
  private:
   // Notifies on new user session.
   void NotifyOnLogin();
@@ skipping 21 matching lines @@
   // login.
   bool current_user_is_new_;
 
   // Cached flag of whether any user is logged in at the moment.
   bool user_is_logged_in_;
 
   NotificationRegistrar registrar_;
 
   friend struct base::DefaultLazyInstanceTraits<UserManager>;
 
+  ObserverList<Observer> observer_list_;
+
   DISALLOW_COPY_AND_ASSIGN(UserManager);
 };
 
 typedef std::vector<UserManager::User> UserVector;
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_USER_MANAGER_H_