Linux UI: Add IsVisibleOnAllWorkspaces()

ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/widget/desktop_aura/desktop_window_tree_host_win.h"
 
 #include "base/memory/ptr_util.h"
 #include "third_party/skia/include/core/SkPath.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "ui/aura/client/aura_constants.h"
@@ skipping 362 matching lines @@
 
 void DesktopWindowTreeHostWin::SetAlwaysOnTop(bool always_on_top) {
   message_handler_->SetAlwaysOnTop(always_on_top);
 }
 
 bool DesktopWindowTreeHostWin::IsAlwaysOnTop() const {
   return message_handler_->IsAlwaysOnTop();
 }
 
 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) {
   return message_handler_->SetTitle(title);
 }
 
 void DesktopWindowTreeHostWin::ClearNativeFocus() {
   message_handler_->ClearNativeFocus();
 }
 
@@ skipping 599 matching lines @@
 
 // static
 DesktopWindowTreeHost* DesktopWindowTreeHost::Create(
     internal::NativeWidgetDelegate* native_widget_delegate,
     DesktopNativeWidgetAura* desktop_native_widget_aura) {
   return new DesktopWindowTreeHostWin(native_widget_delegate,
                                       desktop_native_widget_aura);
 }
 
 }  // namespace views