mash: Fix MusPropertyMirrorAsh for owned properties; add test.

ash/public/cpp/shelf_item_types.h

Index: ash/public/cpp/shelf_item_types.h
diff --git a/ash/common/shelf/shelf_item_types.h b/ash/public/cpp/shelf_item_types.h
similarity index 86%
copy from ash/common/shelf/shelf_item_types.h
copy to ash/public/cpp/shelf_item_types.h
index ea021bb7d78c9b6cb019ffe1af3037c6c1bf7009..448f08e16f72cd2b0c00365da77303e7836e0d6d 100644
--- a/ash/common/shelf/shelf_item_types.h
+++ b/ash/public/cpp/shelf_item_types.h
@@ -1,21 +1,20 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
+// 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.
 
-#ifndef ASH_COMMON_SHELF_SHELF_ITEM_TYPES_H_
-#define ASH_COMMON_SHELF_SHELF_ITEM_TYPES_H_
+#ifndef ASH_PUBLIC_CPP_SHELF_ITEM_TYPES_H_
+#define ASH_PUBLIC_CPP_SHELF_ITEM_TYPES_H_
 
 #include <string>
 #include <vector>
 
-#include "ash/ash_export.h"
-#include "ash/common/shelf/shelf_constants.h"
 #include "base/strings/string16.h"
 #include "ui/gfx/image/image_skia.h"
 
 namespace ash {
 
 typedef int ShelfID;
+const int kInvalidShelfID = 0;
 
 // The type of a shelf item.
 enum ShelfItemType {
@@ -55,7 +54,7 @@ enum ShelfItemStatus {
   STATUS_ATTENTION,
 };
 
-struct ASH_EXPORT ShelfItem {
+struct ShelfItem {
   ShelfItem();
   ShelfItem(const ShelfItem& shelf_item);
   ~ShelfItem();
@@ -88,4 +87,4 @@ typedef std::vector<ShelfItem> ShelfItems;
 
 }  // namespace ash
 
-#endif  // ASH_COMMON_SHELF_SHELF_ITEM_TYPES_H_
+#endif  // ASH_PUBLIC_CPP_SHELF_ITEM_TYPES_H_