Add support for X11 workspaces

ui/views/widget/widget.cc

Index: ui/views/widget/widget.cc
diff --git a/ui/views/widget/widget.cc b/ui/views/widget/widget.cc
index d2b27c9c18a675a16cae216ef469262f809ff120..21fa1f89bdb1f416e74f86e8bab847d9ead11c45 100644
--- a/ui/views/widget/widget.cc
+++ b/ui/views/widget/widget.cc
@@ -129,13 +129,13 @@ Widget::InitParams::InitParams(Type type)
       use_system_default_icon(false),
       show_state(ui::SHOW_STATE_DEFAULT),
       parent(nullptr),
+      workspace(-1),
       native_widget(nullptr),
       desktop_window_tree_host(nullptr),
       layer_type(ui::LAYER_TEXTURED),
       context(nullptr),
       force_show_in_taskbar(false),
-      force_software_compositing(false) {
-}
+      force_software_compositing(false) {}
 
 Widget::InitParams::InitParams(const InitParams& other) = default;
 
@@ -489,6 +489,10 @@ gfx::Rect Widget::GetRestoredBounds() const {
   return native_widget_->GetRestoredBounds();
 }
 
+int Widget::GetRestoredWorkspace() const {
+  return native_widget_->GetRestoredWorkspace();
+}
+
 void Widget::SetBounds(const gfx::Rect& bounds) {
   native_widget_->SetBounds(bounds);
 }
@@ -1110,6 +1114,8 @@ void Widget::OnNativeWidgetSizeChanged(const gfx::Size& new_size) {
     GetWindowBoundsInScreen()));
 }
 
+void Widget::OnNativeWidgetWorkspaceChanged(int workspace_id) {}
+
 void Widget::OnNativeWidgetWindowShowStateChanged() {
   SaveWindowPlacementIfInitialized();
 }