Rebuild aura::Window's property system on top of mojo::View.

mojo/services/public/cpp/view_manager/view_observer.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 MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_VIEW_OBSERVER_H_
 #define MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_VIEW_OBSERVER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 45 matching lines @@
                                    const Rect& old_bounds,
                                    const Rect& new_bounds) {}
 
   virtual void OnViewFocusChanged(View* gained_focus, View* lost_focus) {}
 
   virtual void OnViewInputEvent(View* view, const EventPtr& event) {}
 
   virtual void OnViewVisibilityChanging(View* view) {}
   virtual void OnViewVisibilityChanged(View* view) {}
 
-  virtual void OnViewPropertyChanged(View* view,
-                                     const std::string& name,
-                                     const std::vector<uint8_t>* old_data,
-                                     const std::vector<uint8_t>* new_data) {}
+  // Invoked when this View's shared properties have changed. This can either
+  // be caused by SetSharedProperty() being called locally, or by us receiving
+  // a mojo message that this property has changed. If this property has been
+  // added, |old_data| is null. If this property was removed, |new_data| is
+  // null.
+  virtual void OnViewSharedPropertyChanged(
+      View* view,
+      const std::string& name,
+      const std::vector<uint8_t>* old_data,
+      const std::vector<uint8_t>* new_data) {}
+
+  // Invoked when SetProperty() or ClearProperty() is called on the window.
+  // |key| is either a WindowProperty<T>* (SetProperty, ClearProperty). Either
+  // way, it can simply be compared for equality with the property
+  // constant. |old| is the old property value, which must be cast to the
+  // appropriate type before use.
+  virtual void OnViewLocalPropertyChanged(
+      View* view,
+      const void* key,
+      intptr_t old) {}
 
   virtual void OnViewEmbeddedAppDisconnected(View* view) {}
 
   // Sent when the drawn state changes. This is only sent for the root nodes
   // when embedded.
   virtual void OnViewDrawnChanging(View* view) {}
   virtual void OnViewDrawnChanged(View* view) {}
 
  protected:
   virtual ~ViewObserver() {}
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_VIEW_OBSERVER_H_