cros: Break BaseScreenHandler into two classes.

chrome/browser/ui/webui/chromeos/login/supervised_user_creation_screen_handler.cc

 // Copyright 2014 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/ui/webui/chromeos/login/supervised_user_creation_screen_handler.h"
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 18 matching lines @@
 #include "media/audio/sounds/sounds_manager.h"
 #include "net/base/data_url.h"
 #include "net/base/escape.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 
 const char kJsScreenPath[] = "login.SupervisedUserCreationScreen";
 
 namespace chromeos {
 
-SupervisedUserCreationScreenHandler::SupervisedUserCreationScreenHandler() {
+SupervisedUserCreationScreenHandler::SupervisedUserCreationScreenHandler()
+    : BaseScreenHandler(OobeScreen::SCREEN_CREATE_SUPERVISED_USER_FLOW) {
   set_call_js_prefix(kJsScreenPath);
   ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
   media::SoundsManager* manager = media::SoundsManager::Get();
   manager->Initialize(SOUND_OBJECT_DELETE,
                       bundle.GetRawDataResource(IDR_SOUND_OBJECT_DELETE_WAV));
   manager->Initialize(SOUND_CAMERA_SNAP,
                       bundle.GetRawDataResource(IDR_SOUND_CAMERA_SNAP_WAV));
 }
 
 SupervisedUserCreationScreenHandler::~SupervisedUserCreationScreenHandler() {
@@ skipping 417 matching lines @@
 void SupervisedUserCreationScreenHandler::SetCameraPresent(bool present) {
   CallJS("setCameraPresent", present);
 }
 
 void SupervisedUserCreationScreenHandler::ShowExistingSupervisedUsers(
     const base::ListValue* users) {
   CallJS("setExistingSupervisedUsers", *users);
 }
 
 }  // namespace chromeos