Add support for X11 workspaces

ui/views/widget/desktop_aura/desktop_native_widget_aura.cc

Index: ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
diff --git a/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc b/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
index e1b03bf712757295903be7e180e79d96b45327cd..73a29438dcb32a70a47f02e873658f87ab78e852 100644
--- a/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
+++ b/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
@@ -1157,6 +1157,12 @@ void DesktopNativeWidgetAura::OnHostResized(const aura::WindowTreeHost* host) {
   native_widget_delegate_->OnNativeWidgetSizeChanged(new_bounds.size());
 }
 
+void DesktopNativeWidgetAura::OnHostWorkspaceChanged(
+    const aura::WindowTreeHost* host,
+    int workspace_id) {
+  native_widget_delegate_->OnNativeWidgetWorkspaceChanged(workspace_id);
+}
+
 void DesktopNativeWidgetAura::OnHostMoved(const aura::WindowTreeHost* host,
                                           const gfx::Point& new_origin) {
   TRACE_EVENT1("views", "DesktopNativeWidgetAura::OnHostMoved",