mus: Client-side implementation of modal windows

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/macros.h"
 #include "base/thread_task_runner_handle.h"
 #include "components/mus/public/cpp/property_type_converters.h"
 #include "components/mus/public/cpp/window.h"
@@ skipping 463 matching lines @@
       mus::mojom::WindowManager::kWindowTitle_Property, title);
   return true;
 }
 
 void NativeWidgetMus::SetWindowIcons(const gfx::ImageSkia& window_icon,
                                      const gfx::ImageSkia& app_icon) {
   // NOTIMPLEMENTED();
 }
 
 void NativeWidgetMus::InitModalType(ui::ModalType modal_type) {
-  // NOTIMPLEMENTED();
+  if (modal_type != ui::MODAL_TYPE_NONE)
+    window_->SetModal();
 }
 
 gfx::Rect NativeWidgetMus::GetWindowBoundsInScreen() const {
   return window_ ? window_->GetBoundsInRoot() : gfx::Rect();
 }
 
 gfx::Rect NativeWidgetMus::GetClientAreaBoundsInScreen() const {
   // View-to-screen coordinate system transformations depend on this returning
   // the full window bounds, for example View::ConvertPointToScreen().
   return GetWindowBoundsInScreen();
@@ skipping 360 matching lines @@
 
 void NativeWidgetMus::OnGestureEvent(ui::GestureEvent* event) {
   native_widget_delegate_->OnGestureEvent(event);
 }
 
 void NativeWidgetMus::OnHostCloseRequested(const aura::WindowTreeHost* host) {
   GetWidget()->Close();
 }
 
 }  // namespace views