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diff --git a/WebCore/bindings/v8/custom/V8CustomIDBCallbacks.h b/WebCore/bindings/v8/custom/V8CustomIDBCallbacks.h
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+/*
+ * Copyright (C) 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
+ * 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.
+ */
+
+#ifndef V8CustomIDBCallbacks_h
+#define V8CustomIDBCallbacks_h
+
+#include "Document.h"
+#include "Frame.h"
+#include "IDBDatabaseError.h"
+#include "V8CustomVoidCallback.h"
+#include "V8IDBDatabaseError.h"
+#include "WorldContextHandle.h"
+#include <v8.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+#include <wtf/RefPtr.h>
+
+#if ENABLE(INDEXED_DATABASE)
+
+namespace WebCore {
+
+// FIXME: Maybe split common parts into a base class.
+template <typename ResultType, typename ResultWrapperType>
+class V8CustomIDBCallbacks : public IDBCallbacks<ResultType> {
+public:
+    static PassRefPtr<V8CustomIDBCallbacks> create(v8::Local<v8::Value> onSuccess, v8::Local<v8::Value> onError, ScriptExecutionContext* scriptExecutionContext)
+    {
+        return adoptRef(new V8CustomIDBCallbacks(onSuccess, onError, scriptExecutionContext));
+    }
+
+    virtual ~V8CustomIDBCallbacks()
+    {
+        m_onSuccess.Dispose();
+        m_onError.Dispose();
+    }
+
+    // FIXME: Handle suspend/resume correctly.
+
+private:
+    V8CustomIDBCallbacks(v8::Local<v8::Value> onSuccess, v8::Local<v8::Value> onError, ScriptExecutionContext* scriptExecutionContext)
+        : IDBCallbacks<ResultType>(scriptExecutionContext, this)
+        , m_onSuccess(onSuccess->IsObject() ? v8::Persistent<v8::Object>::New(onSuccess->ToObject()) : v8::Persistent<v8::Object>())
+        , m_onError(onError->IsObject() ? v8::Persistent<v8::Object>::New(onError->ToObject()) : v8::Persistent<v8::Object>())
+        , m_worldContext(UseCurrentWorld)
+    {
+    }
+
+    template <typename Type>
+    void onEvent(v8::Persistent<v8::Object> callback, PassRefPtr<Type> value)
+    {
+        if (!ActiveDOMObject::scriptExecutionContext())
+            return;
+        if (callback.IsEmpty())
+            return;
+
+        v8::HandleScope handleScope;
+        v8::Handle<v8::Context> context = toV8Context(ActiveDOMObject::scriptExecutionContext(), m_worldContext);
+        if (context.IsEmpty())
+            return;
+
+        v8::Context::Scope scope(context);
+        v8::Handle<v8::Value> argv[] = {
+            toV8(value)
+        };
+
+        // FIXME: Make this work for workers.
+        ASSERT(ActiveDOMObject::scriptExecutionContext()->isDocument());
+        RefPtr<Frame> protector(static_cast<Document*>(ActiveDOMObject::scriptExecutionContext())->frame());
+
+        bool callbackReturnValue = false;
+        // FIXME: Do we care if this thing returns true (i.e. it raised an exception)?
+        invokeCallback(callback, 1, argv, callbackReturnValue);
+    }
+
+    virtual void onSuccessAsync(PassRefPtr<ResultType> result)
+    {
+        onEvent(m_onSuccess, ResultWrapperType::create(result));
+    }
+
+    virtual void onErrorAsync(PassRefPtr<IDBDatabaseError> error)
+    {
+        onEvent(m_onError, error);
+    }
+
+    // FIXME: Use OwnHandles.
+    v8::Persistent<v8::Object> m_onSuccess;
+    v8::Persistent<v8::Object> m_onError;
+
+    WorldContextHandle m_worldContext;
+};
+
+}
+
+#endif
+
+#endif // V8CustomIDBCallbacks_h