[webcrypto] Implement structured clone of keys (blink-side).

Source/bindings/v8/SerializedScriptValue.h

 /*
  * Copyright (C) 2009, 2010 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
@@ skipping 42 matching lines @@
 typedef Vector<RefPtr<MessagePort>, 1> MessagePortArray;
 typedef Vector<RefPtr<WTF::ArrayBuffer>, 1> ArrayBufferArray;
 typedef HashMap<String, RefPtr<BlobDataHandle> > BlobDataHandleMap;
 
 class SerializedScriptValue FINAL : public ThreadSafeRefCounted<SerializedScriptValue> {
 public:
     // Increment this for each incompatible change to the wire format.
     // Version 2: Added StringUCharTag for UChar v8 strings.
     // Version 3: Switched to using uuids as blob data identifiers.
     // Version 4: Extended File serialization to be complete.
-    static const uint32_t wireFormatVersion = 4;
+    // Version 5: Added CryptoKeyTag for Key objects.
+    static const uint32_t wireFormatVersion = 5;
 
     ~SerializedScriptValue();
 
     // If a serialization error occurs (e.g., cyclic input value) this
     // function returns an empty representation, schedules a V8 exception to
     // be thrown using v8::ThrowException(), and sets |didThrow|. In this case
     // the caller must not invoke any V8 operations until control returns to
     // V8. When serialization is successful, |didThrow| is false.
     static PassRefPtr<SerializedScriptValue> create(v8::Handle<v8::Value>, MessagePortArray*, ArrayBufferArray*, ExceptionState&, v8::Isolate*);
     static PassRefPtr<SerializedScriptValue> createFromWire(const String&);
@@ skipping 48 matching lines @@
 
     String m_data;
     OwnPtr<ArrayBufferContentsArray> m_arrayBufferContentsArray;
     BlobDataHandleMap m_blobDataHandles;
     intptr_t m_externallyAllocatedMemory;
 };
 
 } // namespace WebCore
 
 #endif // SerializedScriptValue_h