mus: Introduce high-contrast mode in mus.

services/ui/ws/accessibility_manager.cc

+// Copyright 2016 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 "services/ui/ws/accessibility_manager.h"
+
+#include "services/ui/ws/window_server.h"
+
+namespace ui {
+namespace ws {
+
+AccessibilityManager::AccessibilityManager(WindowServer* window_server,
+                                           const UserId& user)
+    : window_server_(window_server), user_(user), binding_(this) {
+  DCHECK(window_server_);
+}
+
+AccessibilityManager::~AccessibilityManager() {}
+
+void AccessibilityManager::Bind(mojom::AccessibilityManagerRequest request) {
+  binding_.Close();
+  binding_.Bind(std::move(request));
+}
+
+void AccessibilityManager::SetHighContrastMode(bool enabled) {
+  window_server_->SetHighContrastMode(user_, enabled);
+}
+
+}  // namespace ws
+}  // namespace ui