Add support for X11 workspaces

ui/views/widget/widget.h

Index: ui/views/widget/widget.h
diff --git a/ui/views/widget/widget.h b/ui/views/widget/widget.h
index 4f95200997b663da2ed5fab97f1bdbb50bc31f97..15781068f22f5df81cf85d1e61a42ccd456119fa 100644
--- a/ui/views/widget/widget.h
+++ b/ui/views/widget/widget.h
@@ -249,6 +249,9 @@ class VIEWS_EXPORT Widget : public internal::NativeWidgetDelegate,
     // |bounds| is in the parent's coordinate system. If the parent is not
     // specified, it's in screen's global coordinate system.
     gfx::Rect bounds;
+    // The initial workspace of the Widget.  Default is -1, which means the
+    // current workspace.
+    int workspace;
     // When set, this value is used as the Widget's NativeWidget implementation.
     // The Widget will not construct a default one. Default is NULL.
     NativeWidget* native_widget;
@@ -787,6 +790,7 @@ class VIEWS_EXPORT Widget : public internal::NativeWidgetDelegate,
   gfx::Size GetMaximumSize() const override;
   void OnNativeWidgetMove() override;
   void OnNativeWidgetSizeChanged(const gfx::Size& new_size) override;
+  void OnNativeWidgetWorkspaceChanged(int workspace_id) override;
   void OnNativeWidgetWindowShowStateChanged() override;
   void OnNativeWidgetBeginUserBoundsChange() override;
   void OnNativeWidgetEndUserBoundsChange() override;