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

chrome/browser/ui/webui/chromeos/login/user_image_screen_handler.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_UI_WEBUI_CHROMEOS_LOGIN_USER_IMAGE_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_USER_IMAGE_SCREEN_HANDLER_H_
 
 #include "base/memory/weak_ptr.h"
+#include "base/time.h"
 #include "chrome/browser/chromeos/login/user_image_screen_actor.h"
 #include "chrome/browser/chromeos/options/take_photo_dialog.h"
 #include "chrome/browser/ui/webui/chromeos/login/base_screen_handler.h"
 #include "chrome/browser/ui/webui/chromeos/login/oobe_ui.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace base {
 class ListValue;
 }  // namespace base
@@ skipping 37 matching lines @@
  private:
   // Opens the camera capture dialog.
   void HandleTakePhoto(const base::ListValue* args);
 
   // Handles clicking on default user image.
   void HandleSelectImage(const base::ListValue* args);
 
   // Called when user accept the image closing the screen.
   void HandleImageAccepted(const base::ListValue* args);
 
+  // Called when the user image screen has been loaded and shown.
+  void HandleScreenShown(const base::ListValue* args);
+
   // Called when the camera presence check has been completed.
   void OnCameraPresenceCheckDone();
 
   UserImageScreenActor::Delegate* screen_;
 
   // Keeps whether screen should be shown right after initialization.
   bool show_on_init_;
 
   // Index of the selected default user image. -1 if the photo is taken.
   int selected_image_;
 
   // Last user photo, if taken.
   SkBitmap user_photo_;
 
   // Downloaded user profile picture if present.
   SkBitmap profile_picture_;
 
   // Its data URL.
   std::string profile_picture_data_url_;
 
   base::WeakPtrFactory<UserImageScreenHandler> weak_factory_;
 
+  base::Time screen_show_time_;
+
   DISALLOW_COPY_AND_ASSIGN(UserImageScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_USER_IMAGE_SCREEN_HANDLER_H_