WebCrypto: Add SHA-1 support to crypto.subtle.digest().

Source/bindings/v8/ScriptValue.h

 /*
  * Copyright (C) 2008, 2009 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 52 matching lines @@
     ScriptValue(v8::Handle<v8::Value> value)
         : m_value(value.IsEmpty() ? 0 : SharedPersistent<v8::Value>::create(value))
     {
     }
 
     ScriptValue(const ScriptValue& value)
         : m_value(value.m_value)
     {
     }
 
+    static ScriptValue createNull() { return ScriptValue(v8::Null()); }
+
     ScriptValue& operator=(const ScriptValue& value) 
     {
         if (this != &value)
             m_value = value.m_value;
         return *this;
     }
 
     bool operator==(const ScriptValue& value) const
     {
         if (hasNoValue())
@@ skipping 63 matching lines @@
 
     PassRefPtr<JSONValue> toJSONValue(ScriptState*) const;
 
 private:
     RefPtr<SharedPersistent<v8::Value> > m_value;
 };
 
 } // namespace WebCore
 
 #endif // ScriptValue_h