[MD] Implement incognito colors as a NativeTheme (for Aura).

chrome/browser/ui/views/chrome_views_delegate.cc

 // Copyright (c) 2012 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/views/chrome_views_delegate.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/prefs/pref_service.h"
 #include "base/prefs/scoped_user_pref_update.h"
 #include "base/strings/string_util.h"
@@ skipping 24 matching lines @@
 #include "content/public/browser/browser_thread.h"
 #include "ui/base/win/shell.h"
 #endif
 
 #if defined(USE_AURA)
 #include "chrome/browser/ui/aura/accessibility/automation_manager_aura.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
 #endif
 
+#if defined(OS_WIN) || defined(OS_CHROMEOS)
+#include "ui/native_theme/native_theme_aura_dark.h"
+#include "ui/wm/core/transient_window_manager.h"
+#endif
+
 #if defined(USE_AURA) && !defined(OS_CHROMEOS)
 #include "chrome/browser/ui/host_desktop.h"
 #include "ui/views/widget/desktop_aura/desktop_native_widget_aura.h"
 #include "ui/views/widget/native_widget_aura.h"
 #endif
 
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
 #include "ui/views/linux_ui/linux_ui.h"
 #endif
 
@@ skipping 410 matching lines @@
   base::AutoReset<bool> in_callback_setter(&in_autohide_edges_callback_, true);
   callback.Run();
 }
 #endif
 
 scoped_refptr<base::TaskRunner>
 ChromeViewsDelegate::GetBlockingPoolTaskRunner() {
   return content::BrowserThread::GetBlockingPool();
 }
 
+ui::NativeTheme* ChromeViewsDelegate::GetNonDefaultNativeTheme(
+    views::Widget* widget) {
+#if defined(OS_CHROMEOS) || defined(OS_WIN)
+  aura::Window* window = widget->GetNativeWindow();
+  for (aura::Window* parent = window; parent;
+       parent = wm::TransientWindowManager::Get(parent)->transient_parent()) {
+    window = parent;
+  }
+
+  views::Widget* parent_widget =
+      views::Widget::GetWidgetForNativeWindow(window);
+  Profile* profile = GetProfileForWindow(parent_widget);
+  if (profile && profile->IsOffTheRecord())
+    return ui::NativeThemeAuraDark::instance();
+#endif
+  return nullptr;
+}
+
 #if !defined(USE_AURA) && !defined(USE_CHROMEOS)
 views::Widget::InitParams::WindowOpacity
 ChromeViewsDelegate::GetOpacityForInitParams(
     const views::Widget::InitParams& params) {
   return views::Widget::InitParams::OPAQUE_WINDOW;
 }
 #endif