[cros] Added histograms for user image usage

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"
 #include "chrome/browser/chromeos/login/screen_observer.h"
 #include "chrome/browser/chromeos/login/user_manager.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "content/common/notification_service.h"
 #include "grit/theme_resources.h"
 #include "ui/base/resource/resource_bundle.h"
 
 namespace chromeos {
@@ skipping 86 matching lines @@
 
   UserManager* user_manager = UserManager::Get();
   DCHECK(user_manager);
 
   const UserManager::User& user = user_manager->logged_in_user();
   DCHECK(!user.email().empty());
 
   user_manager->SetLoggedInUserImage(image);
   user_manager->SaveUserImage(user.email(), image);
   get_screen_observer()->OnExit(ScreenObserver::USER_IMAGE_SELECTED);
+
+  UMA_HISTOGRAM_ENUMERATION("UserImage.FirstTimeChoice",
+                            kDefaultImagesCount,
+                            kDefaultImagesCount + 1);
 }
 
 void UserImageScreen::OnDefaultImageSelected(int index) {
   camera_controller_.Stop();
 
   UserManager* user_manager = UserManager::Get();
   DCHECK(user_manager);
 
   const UserManager::User& user = user_manager->logged_in_user();
   DCHECK(!user.email().empty());
 
   const SkBitmap* image = ResourceBundle::GetSharedInstance().GetBitmapNamed(
       kDefaultImageResources[index]);
   user_manager->SetLoggedInUserImage(*image);
   user_manager->SaveUserImagePath(
       user.email(),
       GetDefaultImagePath(static_cast<size_t>(index)));
   get_screen_observer()->OnExit(ScreenObserver::USER_IMAGE_SELECTED);
+
+  UMA_HISTOGRAM_ENUMERATION("UserImage.FirstTimeChoice",
+                            index,
+                            kDefaultImagesCount + 1);
 }
 
 void UserImageScreen::OnActorDestroyed(UserImageScreenActor* actor) {
   if (actor_ == actor)
     actor_ = NULL;
 }
 
 void UserImageScreen::Observe(int type,
                               const NotificationSource& source,
                               const NotificationDetails& details) {
   if (type != chrome::NOTIFICATION_SCREEN_LOCK_STATE_CHANGED)
     return;
 
   bool is_screen_locked = *Details<bool>(details).ptr();
   if (is_screen_locked)
     StopCamera();
   else if (actor_ && actor_->IsCapturing())
     StartCamera();
 }
 
 }  // namespace chromeos