Set the WM_CLASS property of X11 windows in Linux Aura build.

ui/views/widget/desktop_aura/desktop_root_window_host_x11.cc

Index: ui/views/widget/desktop_aura/desktop_root_window_host_x11.cc
diff --git a/ui/views/widget/desktop_aura/desktop_root_window_host_x11.cc b/ui/views/widget/desktop_aura/desktop_root_window_host_x11.cc
index aa75376f64a3771b851bf98064432c320194a2c8..025108b663fac4a3d902bcd00ee4ac78b45137d0 100644
--- a/ui/views/widget/desktop_aura/desktop_root_window_host_x11.cc
+++ b/ui/views/widget/desktop_aura/desktop_root_window_host_x11.cc
@@ -864,6 +864,11 @@ void DesktopRootWindowHostX11::InitX11Window(
                      PropModeAppend,
                      reinterpret_cast<unsigned char*>(&atom), 1);
   }
+
+  if (!params.wm_class_name.empty() || !params.wm_class_class.empty()) {
+    ui::SetWindowClassHint(
+        xdisplay_, xwindow_, params.wm_class_name, params.wm_class_class);
+  }
 }
 
 // TODO(erg): This method should basically be everything I need form