[cros] OOBE: add histograms for Profile image fetching.

chrome/browser/chromeos/login/user_image_screen.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_IMAGE_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_USER_IMAGE_SCREEN_H_
 #pragma once
 
 #include "base/memory/scoped_ptr.h"
+#include "base/time.h"
 #include "chrome/browser/chromeos/login/camera_controller.h"
 #include "chrome/browser/chromeos/login/profile_image_downloader.h"
 #include "chrome/browser/chromeos/login/user_image_screen_actor.h"
 #include "chrome/browser/chromeos/login/wizard_screen.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
 namespace chromeos {
 
@@ skipping 37 matching lines @@
   void OnNonDefaultImageSelected(const SkBitmap& image, int image_index);
 
   CameraController camera_controller_;
 
   content::NotificationRegistrar registrar_;
 
   UserImageScreenActor* actor_;
 
   scoped_ptr<ProfileImageDownloader> profile_image_downloader_;
 
+  // Time when the profile image download has started.
+  base::Time profile_image_load_start_time_;
+
   DISALLOW_COPY_AND_ASSIGN(UserImageScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_USER_IMAGE_SCREEN_H_