mash: Move directly linked NewWindowDelegate to mojom::NewWindowClient.

ash/common/new_window_client_proxy.h

+// 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.
+
+#ifndef ASH_COMMON_NEW_WINDOW_CLIENT_PROXY_H_
+#define ASH_COMMON_NEW_WINDOW_CLIENT_PROXY_H_
+
+#include "ash/public/interfaces/new_window.mojom.h"
+#include "base/macros.h"
+
+namespace service_manager {
+class Connector;
+}
+
+namespace ash {
+
+// A NewWindowClient which lazily connects to an exported mojom::NewWindowClient
+// in "service:content_browser" on first use.
+class NewWindowClientProxy : public mojom::NewWindowClient {
+ public:
+  explicit NewWindowClientProxy(service_manager::Connector* connector);
+  ~NewWindowClientProxy() override;
+
+  // NewWindowClient:
+  void NewTab() override;
+  void NewWindow(bool incognito) override;
+  void OpenFileManager() override;
+  void OpenCrosh() override;
+  void OpenGetHelp() override;
+  void RestoreTab() override;
+  void ShowKeyboardOverlay() override;
+  void ShowTaskManager() override;
+  void OpenFeedbackPage() override;
+
+ private:
+  // Ensures that we have a valid |client_| before we try to use it.
+  void EnsureInterface();
+
+  // Clears |client_| when |client_| has a connection error.
+  void OnClientConnectionError();
+
+  service_manager::Connector* connector_;
+  mojom::NewWindowClientPtr client_;
+
+  DISALLOW_COPY_AND_ASSIGN(NewWindowClientProxy);
+};
+
+}  // namespace ash
+
+#endif  // ASH_COMMON_NEW_WINDOW_CLIENT_PROXY_H_