Sort out build dependencies for LinuxUI.

ui/views/widget/desktop_aura/desktop_root_window_host_linux.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 "ui/views/widget/desktop_aura/desktop_root_window_host_linux.h"
 
 #include <X11/extensions/XInput2.h>
 #include <X11/Xatom.h>
 #include <X11/Xutil.h>
 
 #include "base/message_pump_aurax11.h"
 #include "base/stringprintf.h"
 #include "base/utf_string_conversions.h"
 #include "ui/aura/client/default_capture_client.h"
 #include "ui/aura/client/screen_position_client.h"
 #include "ui/aura/client/user_action_client.h"
 #include "ui/aura/focus_manager.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window_property.h"
 #include "ui/base/events/event_utils.h"
 #include "ui/base/touch/touch_factory.h"
 #include "ui/base/x/x11_util.h"
+#include "ui/linux_ui/linux_ui.h"
 #include "ui/native_theme/native_theme.h"
 #include "ui/views/corewm/compound_event_filter.h"
 #include "ui/views/corewm/corewm_switches.h"
 #include "ui/views/corewm/cursor_manager.h"
 #include "ui/views/corewm/focus_controller.h"
 #include "ui/views/ime/input_method.h"
 #include "ui/views/widget/desktop_aura/desktop_activation_client.h"
 #include "ui/views/widget/desktop_aura/desktop_dispatcher_client.h"
 #include "ui/views/widget/desktop_aura/desktop_focus_rules.h"
 #include "ui/views/widget/desktop_aura/desktop_layout_manager.h"
@@ skipping 62 matching lines @@
 DesktopRootWindowHostLinux::~DesktopRootWindowHostLinux() {
   root_window_->ClearProperty(kHostForRootWindow);
   if (corewm::UseFocusControllerOnDesktop()) {
     aura::client::SetFocusClient(root_window_, NULL);
     aura::client::SetActivationClient(root_window_, NULL);
   }
 }
 
 // static
 ui::NativeTheme* DesktopRootWindowHost::GetNativeTheme(aura::Window* window) {
+  const ui::LinuxUI* linux_ui = ui::LinuxUI::instance();
+  if (linux_ui) {
+    ui::NativeTheme* native_theme = linux_ui->GetNativeTheme();
+    if (native_theme)
+      return native_theme;
+  }
+
   return ui::NativeTheme::instance();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // DesktopRootWindowHostLinux, private:
 
 void DesktopRootWindowHostLinux::InitX11Window(
     const Widget::InitParams& params) {
   unsigned long attribute_mask = CWBackPixmap;
   XSetWindowAttributes swa;
@@ skipping 1007 matching lines @@
 DesktopRootWindowHost* DesktopRootWindowHost::Create(
     internal::NativeWidgetDelegate* native_widget_delegate,
     DesktopNativeWidgetAura* desktop_native_widget_aura,
     const gfx::Rect& initial_bounds) {
   return new DesktopRootWindowHostLinux(native_widget_delegate,
                                         desktop_native_widget_aura,
                                         initial_bounds);
 }
 
 }  // namespace views