Added kV8MajorVersion.

third_party/WebKit/public/web/WebSerializedScriptValueVersion.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
@@ skipping 22 matching lines @@
 
 namespace blink {
 
 // SerializedScriptValue wire format version. Versions higher than
 // this value will not be deserializable by WebSerializedScriptValue.
 // Embedders may serialize this as out-of-band metadata along with
 // collections of serialized data so that version skew can be detected
 // before deserializing individual values.
 const unsigned kSerializedScriptValueVersion = 16;
 
+// The major version of V8 currently linked with Blink.
+const unsigned kV8MajorVersion = 5;
+
 }  // namespace blink
 
 #endif  // WebSerializedScriptValueVersion_h