mash: Support ShelfModel access in Chrome.

ash/public/cpp/remote_shelf_item_delegate.cc

+// Copyright 2017 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/public/cpp/remote_shelf_item_delegate.h"
+
+namespace ash {
+
+RemoteShelfItemDelegate::RemoteShelfItemDelegate(
+    const ShelfID& shelf_id,
+    mojom::ShelfItemDelegatePtr delegate)
+    : ShelfItemDelegate(shelf_id), delegate_(std::move(delegate)) {}
+
+RemoteShelfItemDelegate::~RemoteShelfItemDelegate() {}
+
+void RemoteShelfItemDelegate::ItemSelected(std::unique_ptr<ui::Event> event,
+                                           int64_t display_id,
+                                           ShelfLaunchSource source,
+                                           ItemSelectedCallback callback) {
+  delegate_->ItemSelected(std::move(event), display_id, source,
+                          std::move(callback));
+}
+
+void RemoteShelfItemDelegate::ExecuteCommand(uint32_t command_id,
+                                             int32_t event_flags) {
+  delegate_->ExecuteCommand(command_id, event_flags);
+}
+
+void RemoteShelfItemDelegate::Close() {
+  delegate_->Close();
+}
+
+}  // namespace ash