Add ability for Widgets to override the DefaultThemeProvider

chrome/browser/chromeos/login/ui/login_display_host_impl.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/chromeos/login/ui/login_display_host_impl.h"
 
 #include <vector>
 
 #include "ash/audio/sounds.h"
 #include "ash/desktop_background/desktop_background_controller.h"
@@ skipping 38 matching lines @@
 #include "chrome/browser/chromeos/net/delay_network_call.h"
 #include "chrome/browser/chromeos/policy/browser_policy_connector_chromeos.h"
 #include "chrome/browser/chromeos/policy/enrollment_config.h"
 #include "chrome/browser/chromeos/settings/cros_settings.h"
 #include "chrome/browser/chromeos/system/device_disabling_manager.h"
 #include "chrome/browser/chromeos/system/input_device_settings.h"
 #include "chrome/browser/chromeos/system/timezone_util.h"
 #include "chrome/browser/chromeos/ui/focus_ring_controller.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/browser/themes/theme_service.h"
+#include "chrome/browser/themes/theme_service_factory.h"
+#include "chrome/browser/ui/ash/multi_user/multi_user_util.h"
 #include "chrome/browser/ui/webui/chromeos/login/oobe_ui.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/grit/browser_resources.h"
 #include "chromeos/audio/chromeos_sounds.h"
 #include "chromeos/chromeos_constants.h"
 #include "chromeos/chromeos_switches.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/session_manager_client.h"
@@ skipping 941 matching lines @@
     keyboard_driven_oobe_key_handler_.reset(new KeyboardDrivenOobeKeyHandler);
   }
 
   views::Widget::InitParams params(
       views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
   params.bounds = background_bounds();
   params.show_state = ui::SHOW_STATE_FULLSCREEN;
   params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
   params.parent =
       ash::Shell::GetContainer(ash::Shell::GetPrimaryRootWindow(),
                                ash::kShellWindowId_LockScreenContainer);

[oshima, 2015/09/10 00:20:38]

this parent will never have associated profile. The screen is always locked by
the 1st user, so i guess you have to use that?

+  // On login screen and logged in as an anonymous user you might not get a
+  // profile. Which indicates that multi-user is not active and an anonymous
+  // profile is in use. Take the active profile to find the theme.
+  Profile* profile = multi_user_util::GetProfileFromWindow(params.parent);
+  if (!profile)
+    profile = ProfileManager::GetActiveUserProfile();
+  params.theme_provider = ThemeServiceFactory::GetForProfile(profile);
   login_window_ = new views::Widget;
   params.delegate = new LoginWidgetDelegate(login_window_);
   login_window_->Init(params);
 
   login_view_ = new WebUILoginView();
   login_view_->Init();
   if (login_view_->webui_visible())
     OnLoginPromptVisible();
 
   login_window_->SetVisibilityAnimationDuration(
@@ skipping 225 matching lines @@
 
   locale_util::SwitchLanguageCallback callback(
       base::Bind(&OnLanguageSwitchedCallback, base::Passed(data.Pass())));
 
   // Load locale keyboards here. Hardware layout would be automatically enabled.
   locale_util::SwitchLanguage(locale, true, true /* login_layouts_only */,
                               callback, ProfileManager::GetActiveUserProfile());
 }
 
 }  // namespace chromeos