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diff --git a/WebCore/bindings/v8/V8NPUtils.cpp b/WebCore/bindings/v8/V8NPUtils.cpp
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+++ b/WebCore/bindings/v8/V8NPUtils.cpp
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+/*
+ * 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
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * 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.
+ */
+
+#include "config.h"
+
+#include "V8NPUtils.h"
+
+#include "DOMWindow.h"
+#include "Frame.h"
+#include "PlatformString.h"
+#undef LOG
+
+#include "NPV8Object.h"
+#include "V8NPObject.h"
+#include "V8Proxy.h"
+#include "npruntime_impl.h"
+#include "npruntime_priv.h"
+
+void convertV8ObjectToNPVariant(v8::Local<v8::Value> object, NPObject* owner, NPVariant* result)
+{
+    VOID_TO_NPVARIANT(*result);
+
+    // It is really the caller's responsibility to deal with the empty handle case because there could be different actions to
+    // take in different contexts.
+    ASSERT(!object.IsEmpty());
+
+    if (object.IsEmpty())
+        return;
+
+    if (object->IsInt32())
+        INT32_TO_NPVARIANT(object->NumberValue(), *result);
+    else if (object->IsNumber())
+        DOUBLE_TO_NPVARIANT(object->NumberValue(), *result);
+    else if (object->IsBoolean())
+        BOOLEAN_TO_NPVARIANT(object->BooleanValue(), *result);
+    else if (object->IsNull())
+        NULL_TO_NPVARIANT(*result);
+    else if (object->IsUndefined())
+        VOID_TO_NPVARIANT(*result);
+    else if (object->IsString()) {
+        v8::String::Utf8Value utf8(object);
+        char* utf8_chars = strdup(*utf8);
+        STRINGN_TO_NPVARIANT(utf8_chars, utf8.length(), *result);
+    } else if (object->IsObject()) {
+        WebCore::DOMWindow* window = WebCore::V8Proxy::retrieveWindow(WebCore::V8Proxy::currentContext());
+        NPObject* npobject = npCreateV8ScriptObject(0, v8::Handle<v8::Object>::Cast(object), window);
+        if (npobject)
+            _NPN_RegisterObject(npobject, owner);
+        OBJECT_TO_NPVARIANT(npobject, *result);
+    }
+}
+
+
+v8::Handle<v8::Value> convertNPVariantToV8Object(const NPVariant* variant, NPObject* npobject)
+{
+    NPVariantType type = variant->type;
+
+    switch (type) {
+    case NPVariantType_Int32:
+        return v8::Integer::New(NPVARIANT_TO_INT32(*variant));
+    case NPVariantType_Double:
+        return v8::Number::New(NPVARIANT_TO_DOUBLE(*variant));
+    case NPVariantType_Bool:
+        return NPVARIANT_TO_BOOLEAN(*variant) ? v8::True() : v8::False();
+    case NPVariantType_Null:
+        return v8::Null();
+    case NPVariantType_Void:
+        return v8::Undefined();
+    case NPVariantType_String: {
+        NPString src = NPVARIANT_TO_STRING(*variant);
+        return v8::String::New(src.UTF8Characters, src.UTF8Length);
+    }
+    case NPVariantType_Object: {
+        NPObject* obj = NPVARIANT_TO_OBJECT(*variant);
+        if (obj->_class == npScriptObjectClass)
+            return reinterpret_cast<V8NPObject*>(obj)->v8Object;
+        return createV8ObjectForNPObject(obj, npobject);
+    }
+    default:
+        return v8::Undefined();
+    }
+}
+
+// Helper function to create an NPN String Identifier from a v8 string.
+NPIdentifier getStringIdentifier(v8::Handle<v8::String> str)
+{
+    const int kStackBufferSize = 100;
+
+    int bufferLength = str->Utf8Length() + 1;
+    if (bufferLength <= kStackBufferSize) {
+        // Use local stack buffer to avoid heap allocations for small strings. Here we should only use the stack space for
+        // stackBuffer when it's used, not when we use the heap.
+        //
+        // WriteUtf8 is guaranteed to generate a null-terminated string because bufferLength is constructed to be one greater
+        // than the string length.
+        char stackBuffer[kStackBufferSize];
+        str->WriteUtf8(stackBuffer, bufferLength);
+        return _NPN_GetStringIdentifier(stackBuffer);
+    }
+
+    v8::String::Utf8Value utf8(str);
+    return _NPN_GetStringIdentifier(*utf8);
+}