include: Add Windows.Foundation.Collections.IPropertySet definition.

include/windows.foundation.idl

@@ -27,6 +27,32 @@ import "eventtoken.idl";
 /* import "ivectorchangedeventargs.idl"; */
 import "windows.foundation.collections.idl";
 
+namespace Windows.Foundation.Collections {
+    interface IPropertySet;
+
+    declare {
+        interface Windows.Foundation.Collections.IKeyValuePair<HSTRING, IInspectable *>;
+        interface Windows.Foundation.Collections.IIterable<Windows.Foundation.Collections.IKeyValuePair<HSTRING, IInspectable *> *>;
+        interface Windows.Foundation.Collections.IIterator<Windows.Foundation.Collections.IKeyValuePair<HSTRING, IInspectable *> *>;
+        interface Windows.Foundation.Collections.IMapChangedEventArgs<HSTRING>;
+        interface Windows.Foundation.Collections.MapChangedEventHandler<HSTRING, IInspectable *>;
+        interface Windows.Foundation.Collections.IMap<HSTRING, IInspectable *>;
+        interface Windows.Foundation.Collections.IMapView<HSTRING, IInspectable *>;
+        interface Windows.Foundation.Collections.IObservableMap<HSTRING, IInspectable *>;
+    }
+
+    [
+        contract(Windows.Foundation.FoundationContract, 1.0),
+        uuid(8a43ed9f-f4e6-4421-acf9-1dab2986820c)
+    ]
+    interface IPropertySet : IInspectable
+        requires Windows.Foundation.Collections.IObservableMap<HSTRING, IInspectable *>,
+                 Windows.Foundation.Collections.IMap<HSTRING, IInspectable *>,
+                 Windows.Foundation.Collections.IIterable<Windows.Foundation.Collections.IKeyValuePair<HSTRING, IInspectable *> *>
+    {
+    }
+}
+
 namespace Windows.Foundation {
     typedef enum PropertyType PropertyType;
     typedef struct Point Point;