linux_aura: Compile ash into chrome.

chrome/browser/fullscreen_aurax11.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/fullscreen.h"
 
 #include <vector>
 
+#include "ash/root_window_controller.h"
+#include "chrome/browser/ui/host_desktop.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h"
 #include "ui/views/widget/widget.h"
 
 bool IsFullScreenMode() {
+#if defined(USE_ASH)
+  if (chrome::GetActiveDesktop() == chrome::HOST_DESKTOP_TYPE_ASH) {
+    ash::RootWindowController* controller =
+        ash::RootWindowController::ForTargetRootWindow();
+    return controller && controller->GetWindowForFullscreenMode();
+  }
+#endif
+
   std::vector<aura::Window*> all_windows =
       views::DesktopWindowTreeHostX11::GetAllOpenWindows();
   // Only the topmost window is checked. This works fine in the most cases, but
   // it may return false when there are multiple displays and one display has
   // a fullscreen window but others don't. See: crbug.com/345484
   if (all_windows.empty())
     return false;
 
   views::Widget* widget =
       views::Widget::GetWidgetForNativeWindow(all_windows[0]);
   return widget && widget->IsFullscreen();
 }