Moves WorkspaceEventHandler to ash/common

ash/mus/bridge/workspace_event_handler_mus.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 "ash/mus/bridge/workspace_event_handler_mus.h"
+
+#include "services/ui/public/cpp/window.h"
+#include "services/ui/public/cpp/window_property.h"
+
+MUS_DECLARE_WINDOW_PROPERTY_TYPE(ash::mus::WorkspaceEventHandlerMus*);
+
+namespace {
+
+MUS_DEFINE_LOCAL_WINDOW_PROPERTY_KEY(ash::mus::WorkspaceEventHandlerMus*,
+                                     kWorkspaceEventHandlerProperty,
+                                     nullptr);
+
+}  // namespace
+
+namespace ash {
+namespace mus {
+
+WorkspaceEventHandlerMus::WorkspaceEventHandlerMus(ui::Window* workspace_window)
+    : workspace_window_(workspace_window) {
+  workspace_window_->SetLocalProperty(kWorkspaceEventHandlerProperty, this);
+}
+
+WorkspaceEventHandlerMus::~WorkspaceEventHandlerMus() {
+  workspace_window_->ClearLocalProperty(kWorkspaceEventHandlerProperty);
+}
+
+// static
+WorkspaceEventHandlerMus* WorkspaceEventHandlerMus::Get(ui::Window* window) {
+  return window->GetLocalProperty(kWorkspaceEventHandlerProperty);
+}
+
+}  // namespace mus
+}  // namespace ash