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

chrome/browser/chromeos/login/user_image_screen.cc

 // 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.
 
 #include "chrome/browser/chromeos/login/user_image_screen.h"
 
 #include "base/compiler_specific.h"
 #include "base/metrics/histogram.h"
 #include "chrome/browser/chromeos/login/default_user_images.h"
 #include "chrome/browser/chromeos/login/login_utils.h"
@@ skipping 53 matching lines @@
       user_manager->GetUserDefaultImageIndex(logged_in_user);
   // The image must have been assigned by UserManager on new user login but
   // under some circumstances (i.e. the data is not written to Local State
   // or the file was corrupt) |kExternalImageIndex| could still be returned.
   if (selected_image_index == UserManager::User::kInvalidImageIndex) {
     LOG(WARNING) << "Default user image index invalid!";
     selected_image_index = 0;
   }
   actor_->SelectImage(selected_image_index);
 
+  profile_image_downloader_.reset(new ProfileImageDownloader(this));
+  profile_image_downloader_->Start();
+  profile_image_load_start_time_ = base::Time::Now();
+
   WizardAccessibilityHelper::GetInstance()->MaybeSpeak(
       l10n_util::GetStringUTF8(IDS_OPTIONS_CHANGE_PICTURE_DIALOG_TEXT).c_str(),
       false, false);
-
-  profile_image_downloader_.reset(new ProfileImageDownloader(this));
-  profile_image_downloader_->Start();
 }
 
 void UserImageScreen::Hide() {
   camera_controller_.Stop();
   if (actor_)
     actor_->Hide();
 }
 
 void UserImageScreen::OnCaptureSuccess() {
   if (!actor_)
@@ skipping 84 matching lines @@
                               const content::NotificationDetails& details) {
   DCHECK(type == chrome::NOTIFICATION_SCREEN_LOCK_STATE_CHANGED);
   bool is_screen_locked = *content::Details<bool>(details).ptr();
   if (is_screen_locked)
     StopCamera();
   else if (actor_ && actor_->IsCapturing())
     StartCamera();
 }
 
 void UserImageScreen::OnDownloadSuccess(const SkBitmap& image) {
+  DCHECK(profile_image_load_start_time_.is_null());
+
+  base::TimeDelta delta = base::Time::Now() - profile_image_load_start_time_;
+  VLOG(1) << "Profile image download time: " << delta.InSecondsF();
+  UMA_HISTOGRAM_TIMES("UserImage.FirstTimeProfileImageDownload", delta);
+
   // TODO(avayvod): Check for the default image.
   if (actor_)
     actor_->AddProfileImage(image);
 }
 
 }  // namespace chromeos