mash: Replace int ShelfIDs with AppLaunchID strings.

ash/public/cpp/window_properties.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/window_properties.h"
 
 #include "ash/public/interfaces/window_pin_type.mojom.h"
 
 DECLARE_EXPORTED_UI_CLASS_PROPERTY_TYPE(ASH_PUBLIC_EXPORT,
                                         ash::mojom::WindowPinType)
+DECLARE_EXPORTED_UI_CLASS_PROPERTY_TYPE(ASH_PUBLIC_EXPORT, ash::ShelfID*);
 
 namespace ash {
 
 DEFINE_UI_CLASS_PROPERTY_KEY(bool, kPanelAttachedKey, true);
+DEFINE_OWNED_UI_CLASS_PROPERTY_KEY(ShelfID, kShelfIDKey, nullptr);

[James Cook, 2017/05/04 16:38:49]

dumb question: Since ShelfID has copy and assignment constructors, do you have
to store it as an owned pointer? Could it just be a value? Or do those have to
be plain-old-data?

[msw, 2017/05/04 19:05:57]

That'd be great, but properties are stored as int64_t, so strings won't work.

 DEFINE_UI_CLASS_PROPERTY_KEY(int32_t, kShelfItemTypeKey, TYPE_UNDEFINED);
 DEFINE_UI_CLASS_PROPERTY_KEY(ash::mojom::WindowPinType,
                              kWindowPinTypeKey,
                              ash::mojom::WindowPinType::NONE);
 
 }  // namespace ash