Add ability for Widgets to override the DefaultThemeProvider

chrome/browser/chromeos/login/ui/lock_window_aura.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/lock_window_aura.h"
 
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "base/command_line.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 "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
 
 namespace chromeos {
 
 LockWindow* LockWindow::Create() {
   LockWindowAura* lock_window = new LockWindowAura();
   // Cancel existing touch events when screen is locked.
   ui::GestureRecognizer::Get()->CancelActiveTouchesExcept(nullptr);
   return lock_window;
@@ skipping 34 matching lines @@
 void LockWindowAura::Init() {
   views::Widget::InitParams params(
       views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
   params.delegate = this;
   params.show_state = ui::SHOW_STATE_FULLSCREEN;
   params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
   // TODO(oshima): move the lock screen harness to ash.
   params.parent =
       ash::Shell::GetContainer(ash::Shell::GetPrimaryRootWindow(),
                                ash::kShellWindowId_LockScreenContainer);
+  // 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

[tdanderson, 2015/09/09 17:38:58]

nit: change . to , between first two sentences (here and elsewhere in the CL)

+  // 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);
   views::Widget::Init(params);
   SetVisibilityAnimationTransition(views::Widget::ANIMATE_NONE);
 }
 
 }  // namespace chromeos