Implementation of 2D canvas context lost/restored events

Source/platform/graphics/ImageBufferClient.h

Index: Source/platform/graphics/ImageBufferClient.h
diff --git a/Source/platform/PasteMode.h b/Source/platform/graphics/ImageBufferClient.h
similarity index 86%
copy from Source/platform/PasteMode.h
copy to Source/platform/graphics/ImageBufferClient.h
index 351e5d432ea0c7ed59b7a0f2cd4e9b18c5579399..4843f50103303c76d0558e9f530c2fc96b2ee257 100644
--- a/Source/platform/PasteMode.h
+++ b/Source/platform/graphics/ImageBufferClient.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Google Inc. All rights reserved.
+ * Copyright (c) 2014, 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
@@ -28,16 +28,18 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef PasteMode_h
-#define PasteMode_h
+#ifndef ImageBufferClient_h
+#define ImageBufferClient_h
 
 namespace WebCore {
 
-enum PasteMode {
-    AllMimeTypes,
-    PlainTextOnly,
+class ImageBufferClient {
+public:
+    virtual ~ImageBufferClient() { }
+    virtual void notifySurfaceInvalid() = 0;
 };
 
-} // namespace WebCore
+}
 
 #endif
+