Reorder browser list on workspace switch

chrome/browser/ui/views/chrome_browser_main_extra_parts_views_linux.h

 // Copyright 2016 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_CHROME_BROWSER_MAIN_EXTRA_PARTS_VIEWS_LINUX_H_
 #define CHROME_BROWSER_UI_VIEWS_CHROME_BROWSER_MAIN_EXTRA_PARTS_VIEWS_LINUX_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "chrome/browser/ui/views/chrome_browser_main_extra_parts_views.h"
+#include "ui/views/widget/desktop_aura/x11_desktop_handler_observer.h"
 
 class ChromeBrowserMainExtraPartsViewsLinux
-    : public ChromeBrowserMainExtraPartsViews {
+    : public ChromeBrowserMainExtraPartsViews,
+      public views::X11DesktopHandlerObserver {
  public:
   ChromeBrowserMainExtraPartsViewsLinux();
   ~ChromeBrowserMainExtraPartsViewsLinux() override;
 
   // Overridden from ChromeBrowserMainExtraParts:
   void PreEarlyInitialization() override;
   void ToolkitInitialized() override;
   void PreCreateThreads() override;
   void PreProfileInit() override;
 
+  // Overridden from views::X11DesktopHandlerObserver.
+  void OnWorkspaceChanged(const std::string& new_workspace) override;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainExtraPartsViewsLinux);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_CHROME_BROWSER_MAIN_EXTRA_PARTS_VIEWS_LINUX_H_