arc: Show custom notification via notification surface

chrome/browser/chrome_browser_main_extra_parts_exo.h

Index: chrome/browser/chrome_browser_main_extra_parts_exo.h
diff --git a/chrome/browser/chrome_browser_main_extra_parts_exo.h b/chrome/browser/chrome_browser_main_extra_parts_exo.h
index aa5612028756a662b9c2acdaefc773569dc956f7..8fc5f060dd8ee57452dd6e3e53f992d1c86e4376 100644
--- a/chrome/browser/chrome_browser_main_extra_parts_exo.h
+++ b/chrome/browser/chrome_browser_main_extra_parts_exo.h
@@ -17,6 +17,10 @@ class Server;
 }
 }
 
+namespace arc {
+class ArcNotificationSurfaceManager;
+}
+
 class ChromeBrowserMainExtraPartsExo : public ChromeBrowserMainExtraParts {
  public:
   ChromeBrowserMainExtraPartsExo();
@@ -27,6 +31,8 @@ class ChromeBrowserMainExtraPartsExo : public ChromeBrowserMainExtraParts {
   void PostMainMessageLoopRun() override;
 
  private:
+  std::unique_ptr<arc::ArcNotificationSurfaceManager>
+      arc_notification_surface_manager_;
   std::unique_ptr<exo::Display> display_;
   std::unique_ptr<exo::wayland::Server> wayland_server_;
   class WaylandWatcher;