Add mash shelf application id support.

components/mus/public/cpp/window_property.h

 // Copyright 2014 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 COMPONENTS_MUS_PUBLIC_CPP_WINDOW_PROPERTY_H_
 #define COMPONENTS_MUS_PUBLIC_CPP_WINDOW_PROPERTY_H_
 
 #include <stdint.h>
 
-// This header should be included by code that defines WindowProperties. It
-// should not be included by code that only gets and sets WindowProperties.
-//
 // To define a new WindowProperty:
 //
 //  #include "components/mus/public/cpp/window_property.h"
 //
 //  MUS_DECLARE_EXPORTED_WINDOW_PROPERTY_TYPE(FOO_EXPORT, MyType);
 //  namespace foo {
 //    // Use this to define an exported property that is primitive,
 //    // or a pointer you don't want automatically deleted.
 //    MUS_DEFINE_WINDOW_PROPERTY_KEY(MyType, kMyKey, MyDefault);
 //
@@ skipping 127 matching lines @@
   void Deallocator##NAME(int64_t p) {                                   \
     enum { type_must_be_complete = sizeof(TYPE) };                      \
     delete mus::WindowPropertyCaster<TYPE*>::FromInt64(p);              \
   }                                                                     \
   const mus::WindowProperty<TYPE*> NAME##_Value = {DEFAULT, #NAME,      \
                                                    &Deallocator##NAME}; \
   }                                                                     \
   const mus::WindowProperty<TYPE*>* const NAME = &NAME##_Value;
 
 #endif  // COMPONENTS_MUS_PUBLIC_CPP_WINDOW_PROPERTY_H_