Linux UI: Add IsVisibleOnAllWorkspaces()

ui/views/mus/native_widget_mus.cc

 // Copyright 2015 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/mus/native_widget_mus.h"
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
@@ skipping 1043 matching lines @@
          window_->HasSharedProperty(
              ui::mojom::WindowManager::kAlwaysOnTop_Property) &&
          window_->GetSharedProperty<bool>(
              ui::mojom::WindowManager::kAlwaysOnTop_Property);
 }
 
 void NativeWidgetMus::SetVisibleOnAllWorkspaces(bool always_visible) {
   // Not needed for chromeos.
 }
 
+bool NativeWidgetMus::IsVisibleOnAllWorkspaces() const {
+  return false;
+}
+
 void NativeWidgetMus::Maximize() {
   SetShowState(ui::mojom::ShowState::MAXIMIZED);
 }
 
 void NativeWidgetMus::Minimize() {
   SetShowState(ui::mojom::ShowState::MINIMIZED);
 }
 
 bool NativeWidgetMus::IsMaximized() const {
   return mus_window_observer_ &&
@@ skipping 360 matching lines @@
 
   gfx::Path mask_path;
   native_widget_delegate_->GetHitTestMask(&mask_path);
   // TODO(jamescook): Use the full path for the mask.
   gfx::Rect mask_rect =
       gfx::ToEnclosingRect(gfx::SkRectToRectF(mask_path.getBounds()));
   window_->SetHitTestMask(mask_rect);
 }
 
 }  // namespace views