linux_aura: Compile ash into chrome.

chrome/browser/fullscreen_aura.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/fullscreen.h"
 
 #include "base/logging.h"
 
-#if !defined(USE_ASH)
+#if defined(OS_LINUX) && !defined(OS_CHROMEOS)

[sky, 2013/09/30 14:45:53]

Since you're in effect conditionally compiling this file, can it be done at the
gyp level?

+
+#include "ash/root_window_controller.h"
+#include "chrome/browser/ui/host_desktop.h"
 
 bool IsFullScreenMode() {
+#if defined(USE_ASH)
+  if (chrome::GetActiveDesktop() == chrome::HOST_DESKTOP_TYPE_ASH) {
+    ash::internal::RootWindowController* controller =
+        ash::internal::RootWindowController::ForTargetRootWindow();
+    return controller && controller->GetTopmostFullscreenWindow();
+  }
+#endif
+
   // TODO(erg): An implementation here would have to check all existing
   // RootWindows instead of just recursively walking the Shell's RootWindow as
   // in the ash implementaiton.
   NOTIMPLEMENTED();
   return false;
 }
 
-#endif
+#endif  // defined(OS_LINUX) && !defined(OS_CHROMEOS)