Linux UI: Add IsVisibleOnAllWorkspaces()

ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc b/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
index de96b6309b1c3847fbd2af2aa5ba4acf8cb8148a..f58bbaa325928ec4f84b24ed524aa1059a694ea3 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
@@ -380,7 +380,11 @@ bool DesktopWindowTreeHostWin::IsAlwaysOnTop() const {
 }
 
 void DesktopWindowTreeHostWin::SetVisibleOnAllWorkspaces(bool always_visible) {
-  // Windows does not have the concept of workspaces.
+  // Chrome does not yet support Windows 10 desktops.
+}
+
+bool DesktopWindowTreeHostWin::IsVisibleOnAllWorkspaces() const {
+  return false;
 }
 
 bool DesktopWindowTreeHostWin::SetWindowTitle(const base::string16& title) {