Implementation of 2D canvas context lost/restored events

Source/core/html/canvas/Canvas2DContextAttributes.h

Index: Source/core/html/canvas/Canvas2DContextAttributes.h
diff --git a/Source/core/html/canvas/Canvas2DContextAttributes.h b/Source/core/html/canvas/Canvas2DContextAttributes.h
index e777ef807783432a629917090d7929fcfddec7d3..dab44564297bd7f44302039f2e7d57b4d6bb44da 100644
--- a/Source/core/html/canvas/Canvas2DContextAttributes.h
+++ b/Source/core/html/canvas/Canvas2DContextAttributes.h
@@ -33,6 +33,11 @@
 
 namespace WebCore {
 
+enum Canvas2DContextStorage {
+    PersistentStorage,
+    DiscardableStorage
+};
+
 class Canvas2DContextAttributes : public CanvasContextAttributes, public ScriptWrappable {
 public:
     virtual ~Canvas2DContextAttributes();
@@ -44,10 +49,15 @@ public:
     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