Implementation of 2D canvas context lost/restored events

Source/core/html/canvas/Canvas2DContextAttributes.h

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
@@ skipping 15 matching lines @@
 
 #ifndef Canvas2DContextAttributes_h
 #define Canvas2DContextAttributes_h
 
 #include "bindings/v8/ScriptWrappable.h"
 #include "core/html/canvas/CanvasContextAttributes.h"
 #include "wtf/PassRefPtr.h"
 
 namespace WebCore {
 
+enum Canvas2DContextStorage {
+    PersistentStorage,
+    DiscardableStorage
+};
+
 class Canvas2DContextAttributes : public CanvasContextAttributes, public ScriptWrappable {
 public:
     virtual ~Canvas2DContextAttributes();
 
     // Create a new attributes object
     static PassRefPtr<Canvas2DContextAttributes> create();
 
     // Whether or not the drawing buffer has an alpha channel; default=true
     bool alpha() const;
     void setAlpha(bool);
 
+    String storage() const;
+    void setStorage(const String&);
+    Canvas2DContextStorage parsedStorage() const;
+
 protected:
     Canvas2DContextAttributes();
 
     bool m_alpha;
+    Canvas2DContextStorage m_storage;
 };
 
 } // namespace WebCore
 
 #endif // Canvas2DContextAttributes_h