XMLHttpRequest#responseText should use a rope

Source/bindings/v8/ScriptString.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 10 matching lines @@
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef SerializedResource_h
-#define SerializedResource_h
+#ifndef ScriptString_h
+#define ScriptString_h
 
-#include "core/platform/SharedBuffer.h"
-#include "weborigin/KURL.h"
+#include "bindings/v8/ScriptValue.h"
+#include "bindings/v8/V8Binding.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
-struct SerializedResource {
-    KURL url;
-    String mimeType;
-    RefPtr<SharedBuffer> data;
+class ScriptString : public ScriptValue {
+public:
+    ScriptString() { }
+    explicit ScriptString(v8::Handle<v8::String> value) : ScriptValue(value) { }
 
-    SerializedResource(const KURL& url, const String& mimeType, PassRefPtr<SharedBuffer> data)
-        : url(url)
-        , mimeType(mimeType)
-        , data(data)
-    {
-    }
+    ScriptString concatenateWith(const String&);
+    String flattenToString() const;
 };
 
-}
+} // namespace WebCore
 
-#endif // SerializedResource_h
-
+#endif // ScriptString_h